Mercury Outboard Carb Rebuild WMK

L6 spin on rebuilding WMK carburetors. Prior to the rebuild the Merc would not start without the warm up lever and would cut out completely while idling. Also suffered a high speed miss as well. An engine only needs 3 things to run: Compression, Spark, and Fuel. Compression came in around 130 psi on all 6 cyl with bright blue sparks as well. L6 Diagnosis = Fuel delivery. Here is the process on rebuilding the WMK carbs and the results. Enjoy.
carb rebuild kit:
amzn.to/3GUWyTy
chem dip carb cleaner:
amzn.to/3Vyvqh9

[@racerrenoveraren6857]

Fantastic! Educational and inspiring. Last three years a have been restoring small engines, mostly OMC’s but a few Mercurys as well. I have a bicycle repair shop located in Nynäshamn, south of Stockholm, Sweden. Keep up the good work!! 👍

[@andygelston9182]

Afternoon. I like your Comment and am awaiting on Son To Get Back To Me Regarding Tillisons or Warbro Carbs For My Merc 50hp BlueBand. I Need Your Help Please. As You Live In Sweden ;I have A Lovely Cresent 25hp Twin Carb Which I AM Restoring And IN Need Of Spares ;But As I Cannot Speak Swedish; I am Having Real Problems With Communicating With The Swedish Company . Can You Be OF Assistance To Me Please????

[@TheMark9013]

Best vid for a basic rebuilding this carb period.

[@austinblaylock7731]

You do an awesome job showing how to do this by the way. Great detail.

[@bearknuckles100]

Thank You Sir! Perfectly clear and easy to follow. Just waiting on my gaskets and good to go. Thanks for taking your time to make these videos.

[@ScottySmac]

Thanks Son, I just completed rebuilding all three of my carbs on my 1987 115 L6 after watching your video several times. I come to find out that my fuel pump was bad too. Whoever rebuilt the fuel pump before me did it poorly. They did not install the rubber diaphragms , only the plastic ones. It's a miracle the engine ran at all. Keep up the great work.

[@greauxpete]

These carbs look exactly like the carbs on my 1984 Mercury 35 HP. Good tip on plugging the lines on top of the carb!

[@emerybadger3780]

About to rebuild my carbs this video helps . All the videos I have seen from you are very educational and your presentation is great and makes it easy to understand. 100% thank you Sir.!

[@MerCSonL6]

You are welcome sir. Son

[@joway97]

MerCSon? I did just as your videos instructed I found the number 3 carburetor partially open correct it then I adjusted the distributor timing from 5 to 0 as indicated in your video. I started it up and OMG! It is idling a lot better I am very much excited I couldn’t have done it with out your videos and your additional guidance! Next is the final tuning of the carburetors in the water in forward gear. You are sincerely awesome! Please continue making more of your dyi videos. I truly am appreciative and grateful for your kindness in sharing your knowledge and experience.

[@MerCSonL6]

Thank you my friend. Son

[@Inspectechhomeinspections]

Tolerance on those tangs is indeed tight. Rebuild on my 1973 1150 went great. Purred like a kitten in my driveway, no leaks. Got it on the water and it chugged and bogged. #2 was overflowing fuel. Lucky it was #2, I was able to pull just the bowl lid on the water and bend the tangs to get a good seat. Was able to get 23 mph on a 20ft 1991 lowe pontoon.

[@thercattrainer]

Last year, I purchased a 1983 Astroglass 165 with a Mercury 115hp L6 that wasn’t running. It has been a long process getting things on it to work again so I try to do that on my days off since I’m semi retired. I just rebuilt the carbs because it was flooding after I rebuilt most of the CDI system. When taking them apart, I noticed that the narrower tangs were put in upside down which would probably explain why the flooding was happening. If I hadn’t watched this video I wouldn’t have known that. Now they are adjusted just right using your wooden board method. Also, as a suggestion I used 1/8” black vinyl end caps that are used on automotive vacuum lines to plug up both of hose barbs on the Back Drag system on each carburetor which is much easier than using heat shrink tubing. They fit a bit snug so you might want to go up to 1/4” size on those. All that I now have left to do is add new oil seals to the lower unit. As always, I enjoy watching your informative videos. They are usually very helpful and informative too, so keep up the good work!

[@jaywalls4913]

Great video... thanks

[@1998jmusmc]

Hey Son, Just want to say thank you sir! My Tower of Power is running like a beast! She no longer has the hard start issues and does not stall in lower gear. She takes off without hesitation frome the holeshot now too. Only issue I have now, is my top carburetor has a steady drip of fuel from the main jet screw cap. I used the black gasket from the rebuilt kit, but makes me wonder if maybe I should look for a cork gasket like the one used for the carburetor bowl. Strange that was not provided in the kit. Either way, I am still a winner on my book!

[@joway97]

About a year ago I purchased a boat with a 1978 Mercury 90hp 900, and I have to say all the videos you have posted have been very helpful to getting this engine started. I’m still having tuning issues carburetor leaking and shifter and throttle cable adjustments. I just watched more of your videos and I hope to have all those issues corrected. Your a blessing for people like me who know nothing about working on boats and their engines. Thank you and God Bless you for your helpful videos.

[@MerCSonL6]

You're welcome my friend. Son

[@joway97]

Is there anyway I can directly contact you, I am still having carburetor/engine trouble. Please & Thank you

[@MerCSonL6]

@@joway97 what's your email?

[@joway97]

Just wanted to ask for your guidance. I followed your instructions and rebuilt my wmk carburetors on a Mercury 900 90hp. I get it started and carburetor is still leaking.

[@MerCSonL6]

@@joway97 the carb that is leaking the tangs are set too low thus keeping the float below where it needs to be. If you pressure test it like in the video it will be perfect. Carbs will leak a little. That's just it's nature but it definitely shouldn't be pouring out. You should be able to see fuel in all 3 brass venturis after priming. Use a flashlight to ensure all levels are the same. Hope this helps. Lmk. Son

[@jonathanpeter1275]

Thanks for this vid. I'm having a lot of trouble removing the brass washer / seat under the needle seat (you removed it with a pick around 7:50). Do you have any tips? Is it possible to damage anything if I miss / scratch anything with the pick?

[@MerCSonL6]

It is possible. You just have to be careful. Fuel flows through there. Son

[@ryanmassie6195]

Great video! I've got a 1980 40hp, starts and idles like a dream but bogs down at wide open throttle. Noticed a leak from the carb when hand priming. I'm thinking my needle is not sealing. Would that also cause the bogging down? Cheers!

[@MerCSonL6]

That's a great place to start!

[@jerevisalli9663]

Thank you, really enjoy the videos. Do you happen to sell parts for these old motors or have good sources? I'm running a 63 100hp.

[@MerCSonL6]

Both. Son

[@KP_Nation]

I have a 79 Merc 900. Would it be good to seal the back drags on those carbs? If so, do I seal off all 3 carbs?

[@MerCSonL6]

Seal all 3. Son

[@sweetwaterLOGIC]

So I’ve been searching for a carb kit for 850 thunderbolt. I’m not that experienced with outboards, and afraid to take the carbs off with out having a kit ready. Having said that I can’t be sure of the kits I am seeing will fit my carbs. It’s a 349 serial series USA. Also there’s a fuel leak from what I believe to be the float bowl, could that be just a gasket or an o ring? Thanks in advance.

[@MerCSonL6]

Look up carb kits 850 on ebay. The leak means either float stuck, spring is off, or the tangs are set incorrectly. Son

[@jamestraves2954]

Hello Great video. Thank you sir. I am about rebuild my carbs on my L6 90 hp Mariner. I do have fuel dripping out of the bottom of the middle carb where there is a brass screw. Does that need an o ring? Also, which kits do I need? My setup looks the same as your video. Thanks Jim

[@MerCSonL6]

No o ring. Just a gasket for the main brass at the bottom of the carbs. I'll include a link below for the kits you need. You will need 3 of them. Son

[@MerCSonL6]

www.ebay.com/itm/Sierra-Marine-Mercury-Mariner-Carb-Kit-Outboard-18-7006-1-/362609160144?mkcid=16&mkevt=1&_trksid=p2349624.m2548.l6249&mkrid=711-127632-2357-0

[@andywstoll]

My bottom carb has a black rubber piece in the center of the float bowl cover. Then the copper washer on top. My other 2 carbs didn't have the black rubber piece. Is the piece supposed to be in there, or should all 3 have it as well?

[@clubdjango]

Thanks for the great video explanation!I just have one question,what is the mail nozzle is for?is it for changing air/gas mix settings?or if not what are the screws for the mix change?Thank you!

[@MerCSonL6]

The idle screws change the amount of air flow and vacuum of fuel from the main jet. Thus the further out (ccw) the more fuel you get dripping BEHIND the butterflies to keep the ignition running at low speeds. It is critical to balance your carbs so each cylinder gets equal amounts of fuel for combustion. Son

[@clubdjango]

Thanks for replying!!! My problem is that once the butterfly closed the motor stops running,if I keep it open it runs no problem ( 9.8)

[@MerCSonL6]

@@clubdjango turn the needle ccw 1/4 turn and try again. This simply means its not getting enough fuel through the idle circuit. Could be the needle is not turn out (ccw) enough or it could be gunked up. Son

[@bigjack5974]

@@MerCSonL6 my problem is I don't know if I'm getting to much gas or not enough. My motor cranks fine. When I give it full throttle, I'm going turtle speed. So I will idle the motor for about 20sec to its top RPM, idle it back down give it full throttle and it takes off normal. What could be my problem? Sometimes I can give it full throttle after the idle, and it will still go turtle speed. Idling it helps sometime, sometime it doesn't. Mercury 40hp 2 stroke.

[@jacksoncash5277]

Hey, what’s up Son. Your videos are really great. You’re like a Mercury outboard expert. I am new to boats and just got one last year with a Mercury 115 (I’m pretty sure a 80’s one). I’ve been watching your videos and looking at my motor. Do you have a video of the 3 carbs being removed? I really don’t want to break anything or do anything I don’t have to do. Thank you

[@MerCSonL6]

Thank you. The process is very similar to this video. I will add it to my list of videos to produce. The key 🔑 is to pull and replace all 3 carbs simultaneously being extremely careful not to bend or put pressure on the plastic throttle connectors. They are old and brittle. Thank you for your comment and good luck sir! Son

[@jacksoncash5277]

You’re welcome and thank you very much for responding. Do you have a video posted of the fuel pump rebuild? And also where do you get your rebuild kits from?

[@ScotchStraight]

Need complete overhaul of wmk 39 carburetor. Any link for that? The 2 lower ones aren't pumping any fuel and the top is dribbling it down.

[@jconlan1970]

Hello, when measuring the tangs per the manual, do you measure off the shoulder or the mating surface of the float bowl cover?

[@MerCSonL6]

I do not measure. I use the flat board system. It's in the video my friend. Son

[@rolandsgarage8640]

I cant get the little main jet out. It's like its seized in and I'm not far from stripping the head off. Any suggestions?

[@MerCSonL6]

Leave it in. But make sure you clean the orifice behind it leading to the fuel bowl. That's where the gunk (greenish) builds up. Hope this helps. Let me know. Son

[@tyronehampton7976]

Do you have the part numbers for the choke shutter screens? My motor was missing them.

[@MerCSonL6]

I do not. But mercury used the same shutters for about 2 decades. If the shoe 👞 fits buy it. Son

[@mercuryoutboardguy1939]

I finished rebuilding my WMK carb on my 402 and I was wondering if you knew the low and high speed idle carb settings also the throttle plate is closed and it’s still idling high any ideas?

[@MerCSonL6]

What degree is your idle? I would retard the timing to slow it down. The high speed is non adjustable. The low speed setting is located to the top right of carb. Boat must be in water. After its warmed up shift the engine into forward gear. To the upper right of the carb if you are facing it there is an idle needle screw. Start with 1.5 full turns out counterclockwise from light seated. Slowly turn in (clockwise) until the engine starts to bog down/stumble due to the lean mixture then/quickly turn it 1/2 turn out to keep from dying. Play around from there until you have if "Perfect" them make one last 1/4 yurn out. Let me know. Son

[@TheRotchy1]

Hi Son can you tell me where I can get the screens that cover the carb openings? Also how do you tighten the pins that hold the tangs in? Do you just bend them a little to pinch the pins? I have a '84 - 90 HP inline six motor. Than you for the great video. I had reservations about preforming the rebuild and now I feel much better after watching you. Just ordered the Mercury complete carb rebuild kit along with the floats. Thank you in advance. Greg

[@MerCSonL6]

www.ebay.com/itm/Choke-Selonoid-Plunger-butterfly-Plates-Carb-Screens-all-Mounting-hardware-/303976615706?_trksid=p2349624.m2548.l6249

[@MerCSonL6]

I happened to have a set. You tighten the pins with pliers. The ends riveted and that locks them in. Good luck and let me know if you have any other questions. Son

[@1998jmusmc]

When you submerged the carburetor over night, did you remove that black plastic piece inside the intake carburetor? It is right before vavle flap. I am worried that might get damaged when soaking over night.

[@MerCSonL6]

I did not. It will not get damaged. If it would make you rest easier, you can remove the Welch plug (be very careful not to strip) directly beneath the carb. Once open you will have direct access to the main nozzle. You can unscrew that with a flat head which will relieve the pressure on the plastic for easy removal. Again, be very careful not to strip the plug or the main nozzle. I've found that over the years removal of these items is more grief than what its worth. Hope this helps. Son

[@1998jmusmc]

@@MerCSonL6 Hi Son, Thank you for responding so quickly. I will leave it on then. I reviewed your video several times and will be doing my carbs this evening. Wish me luck!

[@ryantrotter9576]

Did you soak all the parts that your disassembled or just the base carbs themselves?

[@MerCSonL6]

All parts. Son

[@johnhowell5536]

My top carburetor on my 1982 115 Mercury in line 6 outboard has no Venturi tube. the other 2 carburetors do. The motor runs satisfactory. Should I get one to install or leave it be?

[@johnhowell5536]

problem solved

[@fishingismydrug1]

Wonderful video, Thank You! Is the idle speed control required? What are the pro's and con's of leaving it attached vs removing it?

[@MerCSonL6]

Depends on personal pressure. In my opinion, there are no pros. Cons = it manipulates your timing. I personally do not like anything manipulating my timing except me at helm. ;-)

[@fishingismydrug1]

Thank you! I removed it. I'm finishing going through all three carburetors. Got the tangs set tonight, with any luck I did right! I Will seal off the back drag fittings also. Do I need to seal off the jet, opposite the back drag fitting, on the top of the carburetors?

[@fishingismydrug1]

I removed the idle speed control, sealed off the fittings for the back draft. Removed the fuel pump, it looked good. Ran it at home, on muffs first, then in a trash can, all good. Went to the lake this morning, idles good, holeshot awesome, after 1/4 - 1/2 mile, it started surging - like it was starving for fuel. Any suggestions?

[@lachlandavidson1274]

Hey mate did you happen to work out what was going on with yours? Mines having the exact same issue

[@fishingismydrug1]

@@lachlandavidson1274 Yes I did! I installed the fuel filter backwards!! Once I fixed that, it ran perfect!!!

[@bentramell729]

I would like to but can't figure out what the correct part number for the carbs or rebuild kit for my 88 90hp 2 stroke 3 cylinder outboard engine. Theres so many different kinds

[@1998jmusmc]

Hello Son, I was able to remove everything except for the main jet valves on all three carburetors. I think I probably stripped the first main jet on carburetor #1 and after that it was downhill and gave up. So I ended up soaking all 3 carburetors in vat cleaner overnight with main jets installed. I hope I see a difference performance. Is there a special tool screw driver I should use for the removal of the main jet by chance? I really wish I was able to remove them, but they were on there really tight. Not sure if the person before me torqued them tight or what. Appreciate any tips as always. Thanks,

[@MerCSonL6]

I'm sure that was frustrating. You will be fine as long as you soak them (should probably 2 days), then spray out the main jet from the side bowl and thru the front of the jet. That passage way is the most critical. Hope this helps. Son

[@1998jmusmc]

@@MerCSonL6 Thank you sir. Will soak for 2 days then. Dumb question, when you say "spray out the main jet from the side bowl and thru the front of the jet". Do you mean to spray carburetor cleaner where the location of the main jet is normally removed?

[@MerCSonL6]

@@1998jmusmc if you look into the bottom of the side bowl you'll see a hole.... it tunnels horizontally across to the main jet. You want to force an acetone aerosol in that hole. Then, from the exit point (ie. Stripped jet in your case) spray into the jet. It will exit out of the side bowl where you just sprayed. That "tunnel" is where the majority of carbs issues prevail. Son

[@dustinclutz9634]

The 2 lines you sealed off with shrink tubing.. Are you running straight 2 stroke fuel in the tank? Running a 1986 115 and apparently the oil injection has been deleted, that being said does it matter if those lines are sealed off? Thanks in advance

[@MerCSonL6]

Those are the back drag fittings. They allow air to mix with your fuel at mid range. Thus thinning out your fuel/oil..... i always disable but its not necessary. Son

[@dustinclutz9634]

@@MerCSonL6 Good to know, thanks.. My yammi blew up and had the Merc as a back up.. bottom 2 carbs leak like a faucet.. Watch your video about brass washer that had to come out.. viola. Waiting on the new floats and gasket kit to arrive. Btw bought the Merc for $100 😁

[@transatlantic5227]

Great videos, watced all! Any advice where can I buy online carbs rebuild kit for my Tower 90, ‘79?

[@MerCSonL6]

Ebay. Check out Mercury Outboard Carb Kit. Son

[@VEEZY_FISHING]

Boats.net is probably the cheapest option and you could get parts for your exact motor instead of guessing on eBay

[@ltamikey]

Oldermercs.com

[@bigjack5974]

Hello sir. I see that you seal off the two air flow fuel mix line. Whatever they are use for. Should I do the same for the jet also?

[@bigjack5974]

Hello sir! I rebuild my carb, and my motor ran good for about two months. Now, it's seem as if it's running sluggish again. I have to idle the motor until it reaches it's top rpm, for about 2 to 5min. Then it seem to help it and it runs fine afterwards. After I shut it down and fish for a while it's running sluggish again. As if its running off one cylinder. I will idle it again for 2 to 5min, then it runs good. Hope this make sense. Do I have carb issue again? 40hp mercury 2 stroke.

[@bigjack5974]

Hello sir. What causes and engine to run off one cylinder? 40hp 2 stroke mercury. It cranks find, but when I give it full throttle , I'm going turtle speed. When I idle my motor for about 10 seconds or longer, it starts running better. What causes that?

[@wilfredomedrano4590]

Hi mr. Son, I want to know if you can help me with a mercury 1150 year 1976 I rescue it from the garbage and after cleaning it and washing all three carburetors it still won't start. pistons 1-4 have a PSI of 112 and pistons 5 and 6 have a PSI of 125 each have spark and new spark plugs. could you give me a hint how to repair it? I am an amateur and I have no experience, watching your videos I have done everything and the tests too. Thank you very much in advance

[@MerCSonL6]

Check your email. Son

[@mattsimmons6877]

I was wondering if you could lead me to a carburetor rebuild kit for this exact same carburetor I’m having trouble finding them?

[@MerCSonL6]

www.ebay.com/itm/362609160144

[@joegeezy8969]

hello thanks for info. At 18:40 you mentioned something about a choke mechanism. Mine is cracked and don't know what it's called.

[@MerCSonL6]

Choke butterflies or choke screens. Difficult to find. Son

[@williamfarrow4892]

What carburetor cleaning solvent was used for soaking?

[@MerCSonL6]

Gunk CC3K Carburetor & Parts Cleaner with Drip Basket - 96 fl. oz. www.amazon.com/dp/B000ABGA4E/ref=cm_sw_r_apan_glt_fabc_SGM3M0GYA7FTRMEJZQP4?_encoding=UTF8&psc=1

[@9mmmike642]

I rebuilt my 3 carbs on my 1978 Mercury 900. At least the top 2 carbs leak, can’t tell on bottom carb. They both leak at one of the lower holes, can’t tell which one. Do I need to use Gasoila thread sealant?

[@MerCSonL6]

No, the float settings have to be correct. In my video I show how to place on a piece of wood so all the carbs are getting fuel at the same precise time. Son

[@1998jmusmc]

GM Son, what kind of fuel do you use on your outboard? I've been using regular unleaded with fuel stabilizer mixed with synthetic blend Mercury oil. I wonder if my engine carburetor would run better with a non ethanol gas? FYI I still have not completed rebuilding carburetor since I'm waiting for 3 new floats. The springs on the original floats seemed pretty flat.

[@MerCSonL6]

I use 93 Octane with Star-Tron in every tank. I also run seafoam every other tank. The difference is pretty dramatic when looking thru a boroscope @ your pistons after a few weeks. Son

[@1998jmusmc]

@@MerCSonL6 I'm going to start doing that too. That way I don't even have to worry about using fuel stabilizer a lot considering I fish year-round. Question I noticed that you shrink tubes the vacuum lines going from one side of the carburetor to the other. Did you shrink tube the main vacuum line that goes at the top of the carburetor from the actuator thing too? On my carburetor at the top there's tubing that goes at the bottom of the float Bowl. I notice yours is more like a nut?.

[@MerCSonL6]

@@1998jmusmc I believe you are talking about the ADI WMK carbs that start by activating an enrichment valve that drains fuel out of the top carb into the crankcase? Gravity fed. Yes, I put shrink tubes on both sides of the back drag barbs. I prefer my mixture rich vs lean. I run some of my engines past 6,000 rpms..... no, I do not recommend it. But there's nothing like it.... Son

[@bigjack5974]

What ratio do you use Son?

[@bigjack5974]

@@MerCSonL6 how are you sir? I have one question. Do you recommend removing the connector and replacing them with a 5/16 barbed hose connector so that more fuel can flow through? I hope that make since. Please let me know.

[@gregknox9454]

Now when you replaced that Vacuum line with blanks, Do you still use the Oil tank? or Do you mix 50:1 in the Tank?

[@MerCSonL6]

50:1 with startron and the best gas u can find. Son

[@gregknox9454]

@@MerCSonL6 So you are suggesting that I replace those cross tubes with blanks? And that will help performance? The motor I have 90HP with these three carbs. When I bought it, it would get up to full throttle, and after about 45 seconds of running, it would start to sputter like it lost a cylinder or two, then it would recover. Thanks for the info.

[@lachlandavidson1274]

Did you ever work out why it was doing that? Having the same issue with mine

[@alexcabral8229]

Hello son, I have an l3 60hp and I have been working on the carbs constantly. First the needle and seat were sticking. Replaced those. Now the bottom one carb is leaking a little fuel. Not as much as before. Also what is the best pre set on those carbs to start with.

[@MerCSonL6]

1.5 turns out from lightly seated.

[@alexcabral8229]

Thanks man. You are awesome I have learned so much thank you again.

[@e57dog]

Hello - I am a new boat owner and have a 1976 Mercury 1150. I have watch your video on rebuilding the carbs a few times. Is there just one brand of carb on this this motor? If so, how do I know which carb I have so that I can make sure to order the proper rebuild kit? Thanks in advance

[@MerCSonL6]

All use the same kits. Son

[@e57dog]

Thank you very much!! I appreciate your feedback!

[@truechamp5740]

My mercury 1982 115HP outboard is having a hard time starting and i notices the third carburetor is leaking fuel. would you know what could be the problem?

[@MerCSonL6]

The float is either stuck or the tangs are set incorrectly. Try gently tapping the side bowl to see if the float loosens up. Son

[@payitforward2730]

I have 1986 115hp, was running ok and started being hard to start. Last time out it died at WOT on the way to the ramp. Wouldn’t start back up. Long story short, Got it home have replaced primer, all fuel lines, filter, pump and rebuilt carbs. It starts now and runs for about 2 min then dies. If I pump the primer I can keep it running but if I don’t it’ll die in less than a min. Seems like fuel supply issues but most everything has been replaced. Any ideas? Thanks! Your videos are great!

[@MerCSonL6]

Get a dva and make sure your switches are sending 150-250 volts to each coil. I have a video on that I'll share with you. Son

[@MerCSonL6]

kzbin.info/www/bejne/qKibY3dthZaee8U

[@payitforward2730]

Thanks!!! Actually I figured out the problem, I made a problem while fixing a different one. The fuel pump gasket that mounts against the engine block had the holes in the incorrect spot. So my fuel pump wasn’t getting vacuum from the engine. I cut those out in the correct location in the gasket with an exacto knife. It’s running perfect now! Will have it back on the water in the next day or so to adjust the carbs and should be ready to go for a river ride! Thanks again!

[@zacharyrae3891]

Hi Mercson, i am currently trying to rebuild my 1985 Mercury 115 hp. The needle and seat keep getting stuck, until i blow harder into the fuel line and then it releases. Do you know what is causing this?

[@joshuawilliams4936]

Can you please provide a link to the rebuild kits used in the video thanks Son.

[@MerCSonL6]

Sierra 18-7021 CARB KIT MERCURY www.amazon.com/dp/B00144EPU2/ref=cm_sw_r_apan_i_H3FTYXAK9GDYWTT835BS

[@brettsadler126]

Do you have a specific part kit for rebuilding the carbs? Im about to dig into it and Im also rebuilding the fuel pump and replacing the impeller. Any and all parts reference/source/info is appreicated.

[@MerCSonL6]

www.ebay.com/itm/171860556508

[@brettsadler126]

@@MerCSonL6 thankyou! do you happen to have the numbers for fuel pump and water pump kits?

[@MerCSonL6]

@@brettsadler126 www.ebay.com/itm/131670315710

[@MerCSonL6]

Not sure what inline you are working on but this will work for them.

[@brettsadler126]

@@MerCSonL6 1977 1500 I6

[@roblewis0704]

Man, you are a wealth of knowledge on theses towers, I've owned my 79' 90hp for about ten years and every year it seems to have a different attitude.. with that said is there anything in snyc'ing the carbs after rebuild? I still have no top end, great compression across all cylinders, new plugs wires, fuel lines, filter and good fuel mix.

[@MerCSonL6]

What pitch prop do you have? How heavy is your boat?

[@roblewis0704]

@@MerCSonL6 sorry, it took me some time to get back with you, not a 100% sure on the weight, 16 foot 1979 Ranger bass boat with a 13x19 pitch prop. That's the same prop I've been running for quite awhile, and when the motor is running good she'll run 44hp @ 5500 ish rpms. The motor has a mind of its own, one year it will run great next year it will run poor then the following year it will run great again.?? Same fuel, same NGK plugs every season, same Evinrude/Johnson brand 2 stroke oil, same mix. It just doesn't make sense.

[@roblewis0704]

I should add, when I say there is no top end, it's like you have a air leak in the fuel lines, when you give full throttle it just falls flat on its face.

[@ScottySmac]

@@roblewis0704 Rebuild your fuel pump. It's cheap and easy to do.

[@taank63]

Is there a reason you didn't fully disassemble the carb? on my carb there was some glue put on the plugs on the top and side of the carb. Any idea what it is and do i need to re apply it since i took everything apart?

[@MerCSonL6]

Its not neccessary. The primary areas that need clean are the jets and fuel passages. You are referencing the Welch plugs with the red glue correct? Yes, if you removed them they have to be replaced and sealed. Son

[@taank63]

They are flat headed screw in plugs

[@taank63]

If you email me at [e-mail] I can send you a picture

[@TurboSquare2000]

Got a link for the carb kit for a 150hp engine?

[@samuelelizalde5682]

Hey Son great videos thank you so much but l have a problem my mercury started a week ago but now it won't start can you help me l don't really know how to start my engine properly thank you!

[@MerCSonL6]

Have you tried the warm up lever? Son

[@samuelelizalde5682]

@@MerCSonL6 not sure where is that located, sorry this is my first time dealing with outboard motors.

[@Calamity64]

Just watched the video, nice job. Just trying to understand the 3/32 number you used on the float install. Not sure what the number is representing.

[@MerCSonL6]

3/32 of an inch. Son

[@Calamity64]

But what am I measuring on the float

[@MerCSonL6]

@@Calamity64 you are measuring the spring and the spring only @ the top of the float. The bottom tang when closed measures approximately 13/32 of an inch to the top of carb bowl cover and the drop of the fuel inlet needle is 3/64th of an inch. Very precise. You will need a specific measuring instrument to obtain these measurements in a perfect world. I have found that even with these specific measurements problems can still persist. Use your best judgment..... or follow the video that proves results. Every engine has variations that can negatively affect these measurements. They are more for guide vs reality. I hope this helps. Son

[@Calamity64]

@@MerCSonL6 Thanks for all the help. One more question. The brass tube coming up to spray out in the center of the carb, (a good pic is around 18:24 of the video) My middle and bottom carbs have it but the top card is missing the tube. Will this cause a problem? Is it replaceable? The boat ran when i pulled the carbs but had fuel running out of the carbs. Thanks again for all the help.

[@MerCSonL6]

@@Calamity64 It will definitely need replaced. All of the fuel flows thru that brass tube and it matches the height of the fuel in your fuel bowl. Without it im sure fuel will be pouring out the front of the carb. Hope this helps. Son

[@justinshimp5253]

So if tang isn’t adjusted properly or spring on float is a little bent will that cause that to not seat properly and flood the carb

[@MerCSonL6]

It will flood your engine. It will pour out of the front of the carbs and the back. Son

[@justinshimp5253]

MerCSon L6 thanks man I know I put new seats and they seal but that’s the problem I’ve been having is the flooding and pouring out the front of the carb.

[@fdyhdfhy]

@@justinshimp5253 did you find your issue? Im having the same problem where fuel comes out the front of the carbs when I go to tilt the motor up. Was coming up when I primed it but I’ve managed to get that stopped…. Still comes out during tilting though. And it’s a lot kzbin.infoJUzXmRDX5ls?feature=share

[@Travizzlee]

Whats the wmk stand for?

[@MerCSonL6]

If you find out please lmk lol. Son

[@LuisMartins-dr5gy]

Sorry my question but I’m new in boats and I’m cleaning my carburetors I saw the first one the jet is 20 and the second and third the jet is 74. Is normal

[@joway97]

Greetings MerC son! So today I started up the Mercury 900 90hp. And same thing gas leaking idle was high and fluctuating. When I was watching your carburetor rebuild video I noticed that my float cover was missing the float vent port. I recall that you sealed your carburetor off with heat shrink tubes and mentioned it would be a preference. I sort of understand how the gas flows into the float chamber and passes through the top as the float raises and pushes the needle open for fuel to enter the carburetor. And if the float chamber is constantly full the fuel will continue to over flow out of the carburetor as well as the needle getting stuck will over flow the carburetor. Will sealing off the float vent correct the problem or is the float vent adjustable upon backing it out?

[@MerCSonL6]

Short answer: no. The tangs are set too low. Pressure test like I did in the video and it will be perfect every time. You should be able to see fuel in all 3 brass venturis in the front of the carbs after priming. Use a flashlight to make sure the levels are right in the venturis. Hope this helps! Let me know. Son

[@joway97]

@@MerCSonL6 Thank you again I will watch the video and see how to pressure test the tangs. I will pay close attention to identify the venturi. I will post the results.

[@joway97]

I adjusted the tangs and started it up no leaks. Your awesome! I’m one step closer to getting it the water. I I made a video of the running engine I’d like you to watch and tell me what I should do next regarding the stuttering rough idle? Please and Thank you

[@MerCSonL6]

@@joway97the carbs need to be tuned so all 6 cylinders are getting the same amount of fuel.

[@MerCSonL6]

@@joway97 kzbin.info/www/bejne/g57Hnnanocpgn9U

[@lawdawg1813]

I have a ‘71 TOP 1350 mind if I ask a few questions? Can’t get a consistent idle and have to keep manual choke in half closed, it will idle great for few minutes then on own increase Rpms (>2000), throttle and distributor both move freely and not stuck , any ideas?

[@MerCSonL6]

That's definitely a fuel delivery issue if you have to partial choke to keep running. Have you rebuilt the carbs? The fuel line should be completely clear from the tank, through the fuel pump, into the carbs. Check for blockage or leaks (if fuel can get out, air is getting in. With a 1350 the inside diameter of the fuel line should also be at least 3/8th. Hope this helps. Let me know. Son

[@lawdawg1813]

I have not rebuilt carbs but have replaced fuel diagrams and lines and barbs... seems to get it plenty of fuel. Would carbs impact operation that much?

[@MerCSonL6]

@@lawdawg1813 they all should be sync'd to impact equally. I would discontinue to choke while idling due to the bottom 2 cylinders potentially not getting fuel (choke only activates top 2 carbs). A carb rebuild will likely solve your problem. Choking or increasing rpms to get it to idle forces the fuel into the crank. The engine, when everything is correct, will idle with the no choke, all carbs completely closed, with the timing retarded. A 1971 1350 was one of the first engines to receive the direct charge powerhead before they changed the internal porting which means it should idle and start easier (more of a throaty idle). Let me know if have more questions. Son

[@lawdawg1813]

Mercson thanks for the info, ok I am onto removing carbs and have kits for them, next dumb question... I removed front plate and starter but only can get three of the six bolts removed, can’t get access to top right (behind distributor) nor either bolt on bottom carb, really tight access I can’t get socket or wrench over, sorry for lame question

[@MerCSonL6]

@@lawdawg1813 not lame at all. I use a 11mm socket with a 5 inch extension. The socket has to be a small one to fit behind but it is doable. You might have to turn distributor some to get to the top one. Hope this helps. Let me know. Son

[@andywstoll]

What if my tangs aren't flat, but go down (versus yours that go up a bit)?

[@MerCSonL6]

Use a flat piece of wood..... if air can get in fuel will leak. Pressure tested correctly as soon as you lift your carb top fuel/air should flow. Son

[@halspeed12]

Any suggestions on a 86 classic 50 that the needle and seat won't seal I've replaced the needle but it doesn't have a replaceable seat no brass insert or anything.

[@MerCSonL6]

What carburetor are you referring to specifically? I'm under the impression that all classic 50s have tillotsons or mercarbs.... which both have brass seats. Let me know.

[@halspeed12]

Mercarb I believe it's a WMA 6. Upper carb part#6517A33 Lower carb part#6517A34 Marineengine.com doesn't show one.

[@MerCSonL6]

@@halspeed12 I believe what you have is the center square bowl carbs. The needles hook to the float with 1 single hinge? Have you tried adjusting the float beyond manufacturing specs (7/16in) to put a little more pressure on the inlet seat? I believe there is a "seat." Its just not removable. The tip of the needle should also be rubbery vs all metal. I've only rebuilt a few of these so my memories of them are vague. I hope this helps. Let me know. Son

[@halspeed12]

No these have a round bow and yes needle with a rubber tip I'm taking them off again this weekend I'll take a closer look at the fuel inlet and maybe try adjusting the float a bit more for added pressure

[@maryfithen5006]

Where did you find rebuild kit

[@MerCSonL6]

www.ebay.com/itm/362609160144?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=AdRkBcPPQa2&sssrc=2349624&ssuid=c7HxGSEnQjG&var=&widget_ver=artemis&media=COPY

[@justinepicgaming5774]

Of a 1970 Thunderbolt Mercury 80 horse where can I get the rebuild kit for for it it's the two carburetor to cycle

[@MerCSonL6]

Ebay.

[@rayvs5447]

Speaking of carbs... I have a 1997 115 hp. Mercury 2 stroke.. of the 4 carbs only the top two have springs on the fuel mixture screws. The bottom two are screwed all the way in. I searched KZbin for answers and info on this outboard , not much there...

[@MerCSonL6]

It's probably a 2+2 engine. Only the top 2 cylinders run at idle and all 4 kick in when you throttle. Some people change the bottom carbs to match the top two but its not recommended. Son

[@rayvs5447]

@@MerCSonL6 thank you for the information

[@fast87rx7]

Did you take out the back draft jet or just plug it?

[@MerCSonL6]

I sealed them off with shrink tubes. Son

[@LivetofishOutboardRepair]

MerCSon L6 can you explain why you sealed it and not just replaced the tube that connects them?

[@bigjack5974]

@@MerCSonL6 what about the jet? Do you leave as is, or seal it off also?

[@tyronehampton7976]

Where can I find the choke assembly and the screens for the WMK’s. Need help getting some.

[@ltamikey]

Oldermercs.com had a kit for my 78 900

[@fishingismydrug1]

I couldn't get that link to work.

[@ltamikey]

@@fishingismydrug1 www.oldmercs.com/

[@fishingismydrug1]

@@ltamikey Thank you !!!

[@bigjack5974]

Hello sir. How many turns do I need to get my carb air gas ratio set? Is it 1 1/2 turn? I have a 1079 40hp mercury 2 stroke

[@MerCSonL6]

Start 1.5 out. In forward gear under load slowly turn in clockwise into stumble the quickly turn halfway back out. Son

[@bigjack5974]

@@MerCSonL6 I'm not an mechanic by any means. Lol... Thank God for videos. So, I said all that to ask this. How do I remove the throttle cable on my 40hp Mercury so that I can set my carb? Thanks.

[@MerCSonL6]

@@bigjack5974 should be a size 11 metric bolt. Just loosen until the throttle are is free. Do not loosen too much, I believe it's spring mounted and rotates to release the cable. Hope this helps. Son

[@bigjack5974]

@@MerCSonL6 I wish you had a video on this.

[@mercuryoutboardguy1939]

Just wondering was that idle too high and if so how do you adjust them all at once

[@MerCSonL6]

Mercs idle easier with no back pressure on the exhaust. In this video it was idling -2 degrees ATDC which is excellent. If you want to adjust your idle down tighten your idle screw incrementally under normal operating conditions. Son

[@mercuryoutboardguy1939]

Sorry I’m still learning about outboards what does -2 degrees after top dead center mean? And do you know much about 70s MerControls? Thanks

[@mercuryoutboardguy1939]

Also what is back pressure on the exhaust?

[@MerCSonL6]

@@mercuryoutboardguy1939No worries. -2 ATDC refers to the precise degree on the flywheel the spark on #1 cylinder hits as it cycles thru a revolution. When the piston is at the exact top of the cylinder (b4 it starts going down) this is called TOP DEAD CENTER or TDC. BTDC = before top dead center and ATDC = after top dead Center. The timing advances to BTDC as you Throttle the engine. The lower the timing the slower your engine goes and you eventually start running into ATDC AFTER you hit zero degrees. Which I refer to ATDC as a negative integer. Back pressure: under operating conditions your engine has water that travels up thru the exhaust system and the post combustion gases have to force it's way down thru the water into the lower unit and out the thru hub exhaust system (your prop). This creates negative pressure on all cylinders causing them to work harder to push the exhaust out. Son

[@mercuryoutboardguy1939]

Thank you that clears things up 👍

[@austinblaylock7731]

Do you do any work for people. I just bought a 1984 mercury 115 and it has a small misfire. When it opens up it is fine but a low speeds it kinda runs rough

[@MerCSonL6]

I do. My zipcode is 25405.

[@austinblaylock7731]

Okay awesome that’s about 8 hours away.

[@austinblaylock7731]

@@MerCSonL6 How can I better contact you

[@austinblaylock7731]

@@MerCSonL6 thanks buddy I’ll message you in a bit.

[@austinblaylock7731]

@@MerCSonL6 got it brother

[@mercuryoutboardguy1939]

Hey Son, Do you know what WMK stands for?

[@MerCSonL6]

I do not know. It's branded wmk per engineer @ mercury. If you know the answer please share. Son

[@mercuryoutboardguy1939]

Well I was doing some research and I think it might stand for Walbro mark (model number) just like the mercury mark75 or mercury mark28 so that’s my best guess

[@norwajjohnson8726]

sei un mito

[@dandelao9653]

Hi mate i'm trying to get a carb kit for my mercury 90hp, my carby same as your's, i'm syraggling to get a kit, would you be able to help me pls. thanks mate. danny

[@MerCSonL6]

www.ebay.com/itm/391686271818

[@dandelao9653]

@@MerCSonL6 Thanks mate

[@pertater285]

The throttle shaft on my 402 carb is leaking.. Do you think I should disassemble the carb or try a new spring on the shaft?

[@MerCSonL6]

Reset your float. Son

[@pertater285]

@@MerCSonL6 Okay so I should replace all the float assembly parts like you did in the video?

[@MerCSonL6]

@@pertater285 not necessarily. You have to adjust the tangs so the float rises slightly less. That should stop your leaks. Unless your spring is bent or off. Then replace. Son

[@pertater285]

@@MerCSonL6 thank you so much for the information, wish me luck!

[@pertater285]

Hey son, I did readjust the tangs so the float rises less. Now it seems the motor leaks a lot of gas from the air intake when I tilt it after running the engine. I'm assuming this is a stuck needle, but I'm just wanting to get conformation.

[@justinepicgaming5774]

Where can I order the kit at

[@MerCSonL6]

www.ebay.com/itm/391686271818

[@str8wick3d]

Do you recommended running an inline fuel filter in between the fuel pump and carbs? I'm wondering if it would add restriction.

[@MerCSonL6]

Install the filter after the primer bulb and before the fuel adapter. You'll be able to see what's going in easier. Hope this helps. Son

[@str8wick3d]

thanks I just got done rebuilding mine, fixed a couple leaks but created a new one. Carb 2 is pouring gas out the float chamber top. :( @@MerCSonL6

[@MerCSonL6]

@@str8wick3d probably a stuck float.

[@bentramell729]

Anyone know what lbs to torque the wmk 39 carburetor bolts when reinstalling the 3 carbs back on to the engine?

[@MerCSonL6]

12.5 ft lbs or 17Nm. I would just make sure they tight. Son

[@bentramell729]

@@MerCSonL6 you da man Merc

[@bentramell729]

@@MerCSonL6 well got it all done, it was rough at first still wouldn't stay running had to keep the throttle idler lever up high to keep it running but after awhile of running it I was able to slowly lower that lever and adjust the idle screws in each carb and it finally quieted down and idled on its own sounded pretty good, haven't tried it on the water yet but hopefully all goes well. Never in my 43 years have I even looked at a boat engine til now lol so far so good.

[@terryschlagel5628]

How do get the jet out if stuck

[@MerCSonL6]

Leave it in. Soak it. Then hit with an acetone aerosol. Son

[@terryschlagel5628]

@@MerCSonL6 thank you been watching your vids been helpful chasing issues on my 78 L6 90 adi. No WOT, been sitting went ahead changed all coils due to cracks, both packs, stator bad on one leg , new plugs, now carbs , rebuilt old fuel pump, runs good and idles good , also new prop assembly. Running out of season, got to get it done, so I can finish restore on the boat

[@fdyhdfhy]

Ok so I need some help on my issue. I unbolt the bottom carb bowl top and lift the top out of bowl and put to the side and no fuel comes out. The lines are full and you can see large air bubbles leading from that bowl top through the line and into the next bowl. When I unbolt the next bowls top and lift it out, all the fuel THEN rushes through the bottom carbs bowl top. Is the needle and float set correctly? I don’t think it is as that bottom carb doesn’t seem to get the right amount of fuel. My main symptom I’m trying to fix is I have to pump the primer bulb to keep boat at full speed. Low speed it seems good but once I get up over 30mph for more then a minute it will bog down and want to stall unless you Pump the bulb. I was thinking fuel pump but after witnessing the bottom carb issue I’m leaning more on needle not set correctly… it’s all apart at the moment so I’ll try anything you suggest lol. Fuel pumps are NLA so I’d have to get a second hand one and dude around here wants $275 for a fuel pump.

[@MerCSonL6]

I would check your fuel flow from the tank pickup all the way into the carbs. I had a similar symptom and my pickup in my fuel tank was clogged. Hopefully this helps! Son

[@fdyhdfhy]

@@MerCSonL6 this is something I have never really thought about. Would have saved me hundreds in parts for trouble shooting if it is the problem. I will take a look after this weekend but in the meantime is ever so slightly opened the tangs on the bottom carb to see if it doesn’t help fill that bowl. I hope with a full bowl majority of the time, the engine should run at full speed for more then a minute lol. Will know more after this weekend. I’ll post back

[@fdyhdfhy]

@@MerCSonL6 welp. Had it out in the water. Still doing the same thing and bugging out at high rpm over a minute. Pump the ball and it works again. New issue is the top carb is leaking fuel out of the mouths of the carbs. I’m home now and took the carbs off again and attempted to reset the needle and float flanges. Top one was not level with the prongs. Looks like the inner tang is slightly bent. I attempted to readjust to get as close to level as I can. I tried your method with the peice of wood too see if it seals and all seems well now that I’ve adjusted it. Will know more after I reinstall everything now. I checked the feeder tube from the tank for restriction and there is none. The ball that you pump is broken. I can feel something bouncing around inside the ball. Might be the bottom check valve. Pooched. Got a new one. Hopefully that was the issue the whole time!!!

[@fdyhdfhy]

Had it all installed yesterday. Went to Canadian tire and got a new line and primer bulb. Get it home and install it only to find it’s defective. Won’t hold the fuel in the line. Pump and pump and nothing. Took off the part that goes to engine and used screw driver to press the barb in to allow fuel to pass. Pump the bulb and nothing comes out but air! This is the type of crap that make a guy wanna give up lol. Work today then I’ll return this primer bulb for another new one.

[@MerCSonL6]

@fdyhdfhy I understand your frustration my friend. Don't give up! So close!

[@hammett1985]

I just brought a 1970 larson with a 1350 mercury and the boat and motor was sitting for 25 years and I got it for 500 dollars and the old guy said it had spark so I went to AutoZone got starter fluid spray it and turned it over it started but I know I have to rebuild the carbs and some wires on the motor needs to be replaced but I would love for u to help me in doing this project for me and my wife to get it ready for the summer really would appreciate it I been staying up late watching and learning from u to get the mind set to do it please get back with me on this I will be waiting on a reply and the motor is 1970 mercury 1350 thanks

[@MerCSonL6]

What questions do you have?

[@hammett1985]

@@MerCSonL6 it will be a lot when I start working on it I'll let u know but first to things will be the carbs getting clean and some wires needs replace they are coroaded

[@MerCSonL6]

@@hammett1985 ok. Carbs are top of the food chain. Take your time and do them right. A lot of miscellaneous issues can occur if you rush them. Son

[@hammett1985]

@@MerCSonL6 ok I will let u know when I start

[@andygelston9182]

Afternoon Son, I have a Mercury 50hp 4 cylinder 2 stroke and Need your help Please . The problem is i have 2 Tillison Carbs and The Rubber Bowl Seals keep expanding and going out of shape due to the very high fuel content in the uk. I believe they need to be be VITROL RUBBER SEALS ??????? The threads are realy bad on the Tillisons and will not tighten properly. They are Very Very hard to come by in the uk. I do have 2 WMK CARBS i bought off ebay but they did not come with flat tops and the top one hits the engine; As simple carbs do i still need a fuel pump to run the WMK CARBS??????? or have you any very reasonably priced Tillisons or Warbos you would sell me Please. How can i contact you if you would Not Mind. Kind Regards.

[@MerCSonL6]

I have a box full of carbs. Although, I'm not fully understanding your question. You can leave your email and I'll contact when I get time. Lmk. Son

[@andygelston9182]

Thankyou Son .For Replying so soon. How do I Contact you Please ???? Would like my email address or your phone number ????

[@andygelston9182]

Hi ,Son Did you get my e-mail address for some Tillinson or Warbro CARBS OR Even some TOPS for My WMK S SUPPOSEDLY FOR MY MERC 50HP BELIGUM MODEL BLUE BAND 1979 SERIAL NUMBER 9376717. MY EMAIL IS AGAIN ; [e-mail] kind Regards. Andy. P.S I AM NOW GETTING DESPERATE FOR SOME NOW PLEASE.

[@repentanceMeans2TurnAwayFrom]

Hey Son, Nice video. I just purchased a 1976 Stinger boat. It has the 115HP Mercury. I heard it run at the guys house. It sounded great. Of coarse once I took it out this morning it would not start. I'm thinking about getting the carb kits. What is the best Kit? And where did you get yours? Im going to check compression tonight before I buy anything.

[@repentanceMeans2TurnAwayFrom]

Also any chance I could get the carb Kit Part number?

[@MerCSonL6]

@@repentanceMeans2TurnAwayFrom www.ebay.com/itm/153907260276

[@MerCSonL6]

That's a good kit. You'll need 3 of course. Definitely do a compression test. You 120psi or more all 6 within 10% variance of each other. Hope this helps. Son

[@repentanceMeans2TurnAwayFrom]

@@MerCSonL6 Is this engine worth anything? I couldn't find my tip to my compression tester. I ordered a new one. I did find that the distributor has glued in wires coming out of it. It apparently wasn't firing when I tried to start it.

[@MerCSonL6]

@@repentanceMeans2TurnAwayFrom it's worth it. Compression test is a must. Get the compression readings and we'll go from there. Son

[@joway97]

Here is the link to the video of the results of the engine running after I adjusted the tangs. kzbin.info/www/bejne/aquVhqOdj7-lppI Please would you be so kind advise me on how to or what I should do next to correct the stuttering, sputtering and surging of the engine

[@MerCSonL6]

Compression on all 6?

[@joway97]

@@MerCSonL6 yes.

[@bentramell729]

I love the video but some shots were out of frame and you kinda moved too quick with some of the steps and little pieces, im getting ready to have to do this for the first time ill be referring to this video for sure though, noone else even comes close to showing the steps as well

[@MerCSonL6]

I'm a one man show.... my camera man sucks. Son

[@bentramell729]

@@MerCSonL6 lol didn't mean to give ya a hard time. you really have been a lifesaver for me on the 90hp 88 model mercury I have, just got the carbs broke down cleaned rebuilt and put back together thanks to you, and the entire water pump impeller rebuild thanks to you also.. now I'm curious what the torque lbs are for the 6 bolts to reinstall the wmk 39 carb spine back on to the engine. Ya happen to know? dont wanna strip it or it be too loose to allow a gasket leak.

[@MerCSonL6]

@@bentramell729 I'm sure there are specs. I don't know them off hand. Just make sure they tight. Don't want any air passing through behind em. O, and no offense taken. My production skills are not my thing. It takes longer to produce than the actual work. Son

[@bentramell729]

@@MerCSonL6 trust me I know what you mean on the video editing and producing, 2 min of footage takes awhile to perfect on the editing table lol

[@bigjack5974]

Hello son me again. Lol.... what could be my problem when my 40hp mercury runs great when my fuel tank is about empty? As long as there is 1/4 tank or better, it only runs about 5mph,but when it's low( fuel tank) it runs great.

[@MerCSonL6]

Your tank pickup is the issue. Easy fix. Son

[@bigjack5974]

@@MerCSonL6 i need a new tank?

[@MerCSonL6]

@@bigjack5974 potentially. Or a new pickup. Check to see if your pickup is blocked in anyway. You may have to disassemble. Son

[@bigjack5974]

@@MerCSonL6 I sent some pic to your email. Please check. Looks good to me.

[@MerCSonL6]

@@bigjack5974 does air easily pass through?

[@maryfithen5006]

Is there a difference between 140 and 150 carbs

[@MerCSonL6]

No. Son

[@maryfithen5006]

Thanks

[@MerCSonL6]

@@maryfithen5006 sure thing 👍

[@traviswelch7876]

I am here to see about some help lol I have a mercury 40hp 2 stroke motor need help identifying so I can get parts for it to be back on the water I called mercury dealer they said my serial number is invalid 5661381 I need a rebuild kit for carb but don’t no what model or anything

[@MerCSonL6]

Does it look like a wmk?

[@traviswelch7876]

MerCSon L6 yes it is has # 1388-5677

[@MerCSonL6]

@@traviswelch7876 it should say WMK on the side bowl

[@traviswelch7876]

MerCSon L6 ok I checked it is blank no wmk

[@traviswelch7876]

Is there any way I can send pics

[@TheStone1965]

Hi sir I'm Cj I'm happy to watch your videos thanks for that I want to ask you about my engin it's hard to start I have mercury outboard 90 hp 1988 and if I can get your phone number to help me please if you don't mind.thanks again for everything

[@MerCSonL6]

Thanks. I try to keep my videos simple and to the point. You can leave your email and I'll Contact you. I get a lot requests to be contacted directly. Son