Outboard reed valves

[@michaelb9632]

These videos make me a better mechanic. I really appreciate the extra detail you go into. The theory of how these engines work makes diagnostics so much easier. Thanks again for what you do.

[@DangarMarine]

You're welcome Michael, glad the vids are helping you.

[@engineninjaChris]

This was absolutely the best description of how a 2 stroke outboard works that i have ever seen. AWESOME!!!!

[@tommyno1267]

Q Wa DX vfc, x/t rye t rye et were atw wears df @@@atr 1

[@Ramshackle6984]

After working on motorcycle and boat carbs for the last ten years or so I advocate to all my friends and family how important it is to keep your fuel and carbs clean. People have no idea how small the holes are in the jets and galleries and it doesn't take much at all to clog them. Great video as always.

[@DangarMarine]

For sure. The fuel we buy from water-front marinas certainly doesn't help either.

[@fellovercliff4525]

This guy has saved me sooooooooooooooo much money. If I've got trouble with my 20 hp Yamaha I just go through the vids on this channel, I would be broke otherwise. cheers man, love the channel!

[@DangarMarine]

Great to hear!

[@russellcrawford4809]

that is , without a doubt, the most perfect description of reed valves I've ever heard and saw demonstrated . Love your videos

[@jimbogasoline2042]

Im actually happy that wasn't the fix. It means more vids to watch and learn. You are the only sub I have that I am actually waiting for my phones notification for your new vid. I usually get them early in the morning(4-6 am) and watch them as my day is just getting started. Thanks Stu!!

[@DangarMarine]

Thanks mate, glad to hear you've been enjoying the vids, particularly that early in the morning!

[@hilarytrevornorville4977]

My 175hp 2 stroke Johnson has been giving me a hard start and spitting fuel through the carb......its been a pain trying to fix it but watching and listening to your video gave me hope, you've pin point my problem spot on. Thanks for another great tutorial.

[@austincameron5790]

Man I’ve been watching your videos for years , shoot you’ve even talked me through on a little KZbin comment and helped me get my Yamaha 90 running! Man let me work as an apprentice with you lol

[@brucecliffe6213]

Thanks Stu, That old Yammy I got was running way worse than that one you have there, when I got it. Turned out to be a broken primary wire on No.1 coil pack. I am holding my breath in anticipation. Love your work mate, keep it up. Greatly appreciated. Many thanks.

[@DangarMarine]

Hey Bruce. I'm thinking I'll test the ignition first, mostly as I think it will be easier and doesn't involve taking the powerhead off. Fingers crossed that is all there is to it.

[@brucecliffe6213]

Looking forward to that Stu, as they say, do the easy stuff first as 90% of the time that is where the problem is. But this one has got me scratching my head too. Roll on next weekend! By the way it was your videos on checking the IGN circuits that led me find the problem on mine.

[@crisprtalk6963]

I've had a pretty bad day today. But it sure is nice to sit and watch and listen to you describe stuff I like to learn. Its relaxing. Thank you for making these videos sir.

[@DangarMarine]

Thanks mate, sorry to hear you had a bad day but glad to hear the vids are helping. :)

[@miguelcgamer]

I dangar a few days a go a asked you about my yamaha 60HP 2 stroke problem, it was losing power, I changed spark parts(I dont know the name of the part in english) and it solved the problem! keep the good work mate!

[@DangarMarine]

Nice work, glad it turned out to be something simple. :)

[@miguelcgamer]

Dangar Marine yah, me too!

[@WVFG]

No one chipped you about the timing light, because we all thought you knew what you were talking about. We are in your hands. Good work. 100% not better must mean its almost fixed.

[@DangarMarine]

I don't always explain it the best though! ;)

[@derg1885]

great super shortcut video to learn reed valves!!! all 2 stroke engine owners should watch and learn !(moto cross , outboard etc )

[@DangarMarine]

Thanks mate!

[@TheChexmaster]

Loved this video, as it mirrors so many of my experiences of working with outboards. You find one problem, think you've fixed it and then have to start again. Keep up the good work.

[@DangarMarine]

Thanks mate. Yes, just because you've found "a problem" doesn't mean you've found "the problem"!

[@michaelboykin9881]

My 97 yammie 40 ran great until recently. Last few trips out I've had a large loss in hp and speed has gone from 30mph to 20 mph. New plugs, new fuel pump. Clean fuel, new filter and water separator, compression just over 100 each cylinder. I'm hoping it's just the reed valves. Great video as always. Keep em coming. Mike from Florida.

[@hiimtoxic9518]

Was it reeds

[@michaelboykin9881]

@@hiimtoxic9518 Nope. Took it out today after completing a full rebuild in all 3 carbs and it ran like a brand new motor. Everything was clogged. The jets, the needle seat in one carb was so bad you couldn't see light through. All the small ports were clogged. It was bad.

[@markolav7017]

Great video Stu..look forward to the diagnosis next week. On another note... thanks for your advice on the underfloor tank situation..my mate is binning it as we can still smell fuel ....He decided to build a rear lounge and purchase two 25 litre plastics to go underneath...I was supportive of this !

[@DangarMarine]

Thanks mate. Sounds like he is taking a good route with his fuel tanks, I don't think he'll regret the change.

[@johnwills9303]

Excellent explanation on reed valves Stu. Thanks so much. The more I look at my engine the more jobs I discover I may have to do! The joys....

[@DangarMarine]

Thanks John, good luck with your motor!

[@seanp7253]

You are so good at making videos, it's honestly refreshing. Thank you again for another excellent explanation.

[@DangarMarine]

Thanks Sean, glad you enjoyed it.

[@timbarton5316]

Yes I got two almost new reed blocks for my 96 force 120. I can’t see any day light through them, also replaced the gasket ,it made a world of difference, snappy throttle response easy starting, The service manager said there is 8000s of a gap that tolerated on the force 120 but I beg to differ, like you said there should be no daylight looking through the read blocks, thanks for the great advice and videos keep them coming

[@DangarMarine]

Thanks Tim, great to hear your outboard is running sweetly now. :)

[@lachlanoneil8938]

You just need a new engine anything pre 2000 is a right off.

[@kieronr1]

Ace video as usual Stew. I have a small repair shop and really value the info you share. Picked up some great pointers from you mate. Thanks a million for the time and effort you put into this. If you ever make a video compilation I will gladly purchase from you. Well worth whatever you charge.

[@DangarMarine]

Thanks mate, glad the videos have been helping you. Good luck with your shop, I know exactly how hard it can be to keep a small shop open and profitable.

[@weezzell5400]

you make the best videos ...in glad that I found your channel ....been following for a few weeks now .....I'm in the middle of re ringing a 1987 120hp evinrude ...and your videos are so detailed....love that you make it so easy to understand ....thanks

[@DangarMarine]

Hey mate, glad you have joined us and are enjoying the vids. Good luck with your Evinrude rebuild. :)

[@dannyheard2449]

Since unfortunately myself and a lot of other people are out of work right now I had time to work on my outboard and I'm glad I watched your video's because after pulling the reeds which seemed fine i focused on the carburetors and it was the idle mixture screw on my bottom carburetor out of adjustment,mad it backfire so bad it would stall.

[@logtail]

I just found a bad reed thanks to this guy. Found a leak during a cylinder leakdown test; verified a bad reed with a flashlight.

[@motorv8N]

Sorry it didn't work out but if it's any consolation I've been boating for about 40 years now and never really understood how reed valves worked...until now...so thanks Stu!

[@DangarMarine]

Thanks mate, glad you enjoyed the vid. :)

[@rolvon]

Thanks Stu, I'm familiar with reed valves in bikes but not outboards. Nice to see there isn't much difference at all.

[@DangarMarine]

Hey Ron, yeah, it's pretty much the same for all two stroke motors. It is nice to know that once you figure one out you are good to go for all the others.

[@graymodeler]

A term you will hear around 2 strokes is transfer ports. You drew that on the board. Max power is somewhat determined by the design and number of the transfer ports leading to the cylinder. The crankcase is pressurized until the ports are uncovered by the piston downward movement . Key is that exhaust port is uncovered first then the intake which will scavenge the remains exhaust gases out. Some 2 strokes don't have reed valves and some others in motorcycles have a rotary valve. Cool stuff.

[@DangarMarine]

Ah, interesting about some bikes having rotary valves, I'll have to look into those. From what I hear the shape of the exhaust after the port is critical with 2-strokes too to get the gasses extracted efficiently.

[@AuMechanic]

Keep in mind that the transfers are effectively the intake valves for the cylinder when compared to a 4 stroke.. Where the 2 stroke intake is the intake to the crank case not the cylinder. Transfers mostly influences mid range power up to peak, once a 2 stroke is at peak it tends to over scavenge so much intake spills from the exhaust port, hence an exhaust provides back pressure to plug escaping intake charge at peak. One important moment is blow down time which is the period the exhaust is open for and transfers not yet open when initial cylinder pressure blows down out the exhaust. A piston port intake timing has symmetrical so opening and closing is equal degree from TDC like exhaust and transfers, all controlled by piston. The disc valve is asymmetric so intake opens a lot earlier that allows the crankcase to equalise pressure through the carby instead of back flowing down the open transfers as the piston is rising. The reed valve timing is like a disc valve timing at low revs opening very early and then like a piston port at high revs, so the opening point in degrees gets later as engine speed increases, so rotary disc has an advantage in smaller engines due to less gas inertia where reed is as good as disc over about 150 cc per cylinder..

[@JustMike2791]

You're an excellent mechanic. Thank you for doing these videos

[@Mallrunner]

wow. great way to explain how 2 strokes work. I never fully understand until this moment

[@DangarMarine]

Glad the video helped. :)

[@travis.stevens]

Was totally expecting it to run like a charm! I can't take the suspense any longer! Hurry up next week :)

[@DangarMarine]

Me too!!!

[@teslacube]

meee 3

[@PikachuReesesPieces]

stu id like to thank you for your videos the way you describe , explain , demonstrate everything is just so ... confidence inspiring i can't tell you or thank you enough i recently decided after binge watching many of your videos to change my reeds on my 90 evinrude 60 hp and as you've stated many times it was easy and i owe you for helping me do it with confidence again thank you for your time and your videos keep up the terrific videos

[@DangarMarine]

Thanks Chris, glad the vids have been helping you. :)

[@TimsWorkshopTJY]

Hi Stu, easy fix on hot water heater. just needed the winterizing valve turned to let the air trapped in the top of the tank out. got hot water now for the rest of the trip.

[@DangarMarine]

Good news! :)

[@ThatBoatGuy]

Make sure that the air mixture screws are turned out a little over 2 turns. Seems like the common Yamaha lean sneeze.

[@DangarMarine]

Hey Eric, I did have a play with the mixture screws and they seem to be set fine, but I'm going to go through a whole range of mixture / choking / sparing fuel to test which is lean in the next vid.

[@dongorsegner4607]

Still trying to figure out the problem with my 75 hp Mercury on the invader. Gone through the entire fuel system, checked timing, like you said still 100% not fixed. Someone suggested looking at the reed valves, thanks for the great lesson professor Stu.

[@DangarMarine]

You're welcome Don, good luck!

[@Hamchuck112]

Great video. The drawing on the board really helped.

[@francoisbrand7464]

Mate @ 9:02 i thought u were gonna keep rolling straight down into the lake for a water test! spot on vids!

[@jasonu1123]

Sounds like there is either a bad head gasket or possibly a bad crank. Will it run better if you choke the carbs out manually by hand?

[@DangarMarine]

The head gasket was changed in the previous video and choking doesn't seem to help much, but will confirm during the follow up video.

[@jasonu1123]

It sounds like the cylinders are swapping air back and forth. If it's not the head I wouldn't be surprised if its' the crank labyrinth seals that are shot.

[@charlesgoodman1608]

Question. Did you do a video on the replacing the reed valves? Thanks to you video I found two leaking into the air box

[@Fireship1]

Never had to replace reeds on a two stroke. Yet. Lol. I look forward to the next video. I'm sure your going to figure it out Stu!

[@DangarMarine]

I've never had to replace a set yet either which is why I don't often suspect them. I'm not sure what it would take for them to fail, even in these old saltwater motors they always seem fine.

[@claudiocavi4070]

Great video, wondering if you found the actual problem of that motor , my Johnson 40 hp 91 is doing the exact same thing changed carbs ,ignition flywheel, still doing it

[@jingjang299]

Hi , did you fixed that squeze noise ?

[@josephguarino1546]

My 70 hp 1984 2 stroke Johnson 3 cylinder is only firing on 2 cylinders. Gas is spraying out the front of the carburetor and the spark plug for that cylinder is clean. I replaced the carb but still having the problem. Watched your great video and I think the reed valve may be my problem. Your thoughts.

[@DangarMarine]

That is a classic symptom of a reed valve problem.

[@barnyduffy1531]

hi never worked on an outboard but have used several of your very well described techniques for cleaning, adjusting electrics and carburation on motor bikes. one adjustment i would check was the carb float travel as the fuel level in the carb affects the amount of fuel being sucked into the engine. but i guess your low idle mixture screw would compensate for any variation in fuel Hight ( in the carby). great video's very well explained

[@DangarMarine]

Thanks mate, glad the vids have been helpful. Yes, having a correct float level is very important to get the correct mixture.

[@lupdogdog5371]

Can it cause the motor to bog out when full throttle

[@DangarMarine]

Generally going lean.

[@lupdogdog5371]

Can't figure it out engine bogs high rpm This is a force 75 horse power engine 3 cylinder One carburetor any suggestions

[@graymodeler]

Yes Stu, 1969 Kawasaki's had rotary valve discs as well as Spanish Montesa motocross bikes. An expansion chamber on the exhaust side helps as well.

[@DangarMarine]

We have an old Kawasaki in the shop at the moment that needs repairing. Will interesting to get into that job.

[@ronpowell2373]

DAP go kart engines had rotary valves and there was one with desmodrodic (?) cam driven inlet valves- which defeats the whole idea for a two stroke engine for me. Poppets have been used in the past as well.

[@Fireship1]

William Fowler had an 80s Kawasaki KE100 years ago that never ran right (bought it used) threw a ton of parts at it, still never ran right. Turned out to be rotary valve seals. Changed that out and she ran like a scalded cat! A good motorcycle shop gave me the free advice that pointed me in the right direction.

[@gbass7328]

Thoughts on using fuel additives for cleaning 2 stroke fuel systems?

[@TimsWorkshopTJY]

Hi Stu, on your motor issue I read that the piston could have a hole that is allowing leak internally. did you do a compression check on both cylinders?

[@DangarMarine]

Hey Tim, yep, did the before and after compression test in the recent head gasket video.

[@mrmidnight32]

My outboard misfires on one cylinder mid throttle but isles and full throttle fine. Timing issue? Spark plug gap issue? I keep getting a puff of smoke or fuel vapor out of these just behind the carburetors. Johnson/OMC 200 V6 outboard 2 stroke

[@DangarMarine]

Could be spark, but I would definitely investigate the leak behind the carburettors and fix that first. Could be reed valves if it is a two stroke.

[@chackett99]

Excellent video and description. I'm chasing down a problem on my old Suzuki DT200 and removed the oil injection system and moved to pre-mix. It got me to wondering how exactly the crankcase and internals get lubricated. Your drawing helped me understand that. Cheers!

[@markm8174]

So by looking at your diagram it looks like bad reed valves could cause lower compression readings?? My Yamaha 115 is starting to drop compression. Runs great but compression is around 90 psi on all cylinders.

[@DangarMarine]

No, the charge is compressed very slightly in the crankcase, just enough to get it to transfer through the port to the top of the cylinder where the piston compresses it up to combustion pressures. If that is low it is still about the rings being worn.

[@ronpowell2373]

The reed valves just stop the air fuel mix from reverse flowing out the carburetor as the piston goes down the bore. So, because the air fuel mix cannot go out the carburetor, it goes the only way it can, up through the transfer ports and onto the top of the piston. With out the reeds you still get the transfer of fuel air up to the top of the piston, but a percentage would back flow the carb . So the reeds just make the engine more efficient and powerful

[@davidsayre7728]

So can you get low compression on a cylinder due to a bad reed?

[@DangarMarine]

No, only low compression in the crankcase (which isn't very high anyway) and fuel spitting back out the carburettor.

[@dennisdekkers4548]

Great video again, love your drawing of the reet valves, Learning a lot evry week. Keep up the good work. Big fan from the Netherlands!

[@DangarMarine]

Thanks Dennis! :)

[@tristancooper3361]

Hi the two line on the reed values what are there use

[@DangarMarine]

Hey Tristan, can't quite picture it in my head at the moment. Are you referring to gaps in the plates that limit the travel of the reed valves (ie, how far they can open) If so I imagine it is just so they don't restrict air flow too much.

[@juniorjr7026]

hello Chris I have a Yamaha 40hp 2 strokes with the same problem as the engine in the video, did you manage to solve it? if you can tell me what that was it will help me a lot. Thank you so much

[@jingjang299]

Hi , did you fixed that squeze noise ?

[@johnjones-uz4pi]

Hi. If like in some performance reed valve kits which allow the reed petals to open more, will this give u more power/speed top end? Many thanks.... jj

[@luisvelez1134]

How did you determine it was a head gasket issue.

[@dalelee2820]

Do you have a video on a four-cylinder 2-stroke bottom to carburetor do not have suction

[@jimdrechsel3611]

very good explanations. Can reed valve plates be replaced without exchanging the entire assembly? If so do you have a video on doing that service? Enjoyed it. Thanks

[@lovund86]

Hi there, and greatings from Norway. I have a frind tat hade the same problem with his 25Hp Yamaha, semes to be almost the same engine, it was coughing and it was spewing a cloud of petrol out of the bottom carb every time it misfiere `d. He checked everything, changed piston rings, all the seals, cleaned carburetors, he finaly took of the flywheel and found a chafed wire, repaird that then everything was fine.

[@DangarMarine]

Yes, it can take quite a while to find the problem some times but it's always satisfying when you do!

[@wassergaukler]

Great Video, I found that the lowest reed valve on my 3 cylinder 2 stroke was rusted an got a little lime on. This points to other problems aswell, i guess. After looking at the cylinder head, i found a lot of gunk, lime and rust. I will change the whole Cylinder head with gaskets. Do you see any other points where water could come into this area around the reed valve? Thanks.

[@azric1302]

Great videos Stu! Question, I have a 3 cylinder Johnson 70hp where the bottom cylinder overheated and melted the rod bearing. Upon analysis in a sober state, the reed valve for this cylinder has a 4mm gap. Could this be a high probability for causing my engine failure? Thanks much and cheers!

[@DangarMarine]

Yes, it can cause the cylinder to run lean and get hot.

[@joshuathomas3483]

The video helped out alot. But what if you're trying to replace the reeds and you can not find them online? I've went to several websites and can not find them or they are no longer made. The ones I do find, the price for them are doubled. Any suggestions?

[@sammarler8513]

If reeds are bad with a carburetor have a black stain to the intake. I have a 3 cylinder Yamaha and the bottom carb has a black stain that’s hard to rub off on the intake side. The rest of the carbs are clean and shiny

[@jamesdahmer5027]

whoa! dude! mind blown with your chalkboard demonstration. Thanks heaps!

[@DangarMarine]

Thanks mate, glad you liked it. :)

[@heffptbo]

My Johnson 70 has a hard time starting... and once run and shit down needs like a tree warm cycle. I have changed the fuel pump, primer solenoid and now i am wondering about reeds..i noticed on idle there was some gas bubbles coming from the prop exhaust the other weekend. I have had issues flooding while trying to start a lot of times on cold start.

[@bransayler]

Could bad Reed valves possibly be the cause of excessive unburnt gas coming out the exhaust? I recently rebuilt carbs on a 96 Johnson 130 HP, and get quite a healthy pool of unburnt gas/oil in the lake. Nothing leaking from the carbs in the housing. Just started happening. Trying to pin point the cause. Thanks

[@DangarMarine]

Generally bad reed valves will mainly cause unburnt fuel out the carbs rather than exhaust.

[@bransayler]

@@DangarMarine Thanks for the reply. You think it's most likely a carb issue since it happened after I rebuilt them? Also used that OMC engine tune up, so could still be gunk from exhaust due to that? Thanks again

[@cecilchristopher2996]

Do you have any videos dealing with inboard engine water pumps

[@DangarMarine]

Hey Cecil, no, we only ever do outboards.

[@DMF351]

Hey, this motor has done a crank shaft seal. I had twin cylinder Yamaha that did the same thing and found a blown crank seal. If your lucky it will be the top seal under flywheel. Interestingly mine did the top seal but the spark plug for the top cylinder looked like it was fouled from running rich. I couldn't get my head around it as that cylinder should have been leaning out.

[@DangarMarine]

Yes, I'm thinking a pressure test will be the way to go before getting into the ignition. It will be interesting to see. It is odd about your top spark plug being fouled rather than whiter.

[@stewh1263]

i have seen 2 stroke cycle explained before ,but i finally understood it thanks to your explanation. my 9.9hp 2 stroke is doing exactly the same thing.im thinking one of the coils/leads is breaking down- any thoughts??

[@DangarMarine]

It could be leads but in the end this outboard turned out to have a problem with the carburettors not being synchronised kzbin.info/www/bejne/hJ_SpYSjo7Crga8

[@jerryalvarez1967]

Awesome videos, i no longer have a boat but you are very informative and do a great job explaining! Thank you for your time creating the videos!

[@DangarMarine]

You're welcome mate, glad you've been enjoying them. :)

[@sandro2122]

Your videos are excellent.

[@DangarMarine]

Glad you like them!

[@sandro2122]

WME carbys flooding! Other than reed valve failing what's most likely cause for this issue? Thanks in advance

[@robbieduke944]

I have a 1982 90 HP Johnson, do you have a video on pulling and replacing the Reed valves, love your videos can you please help me???????????

[@Crazedjoker2008]

What caused a boat to lose tons of fuel out the exhaust side? I have a Suzuki pu40r and it won’t run good at all. I noticed it leaking fuel out the jet when I started it and once I cam back from the river it was all over the ground.

[@wrench-weld-build6545]

Can a stuck reed valve cause a cylinder to lock up when cold cranking? Outboard has been sitting for several years. Spins free until it gets to what I believe the exhaust stroke on cylinder 2.

[@timbarton5316]

I have a 96 force 120, two carbs,no fuel spitting out, runs pretty well starting good, I pulled reed blocks out and I can see daylight in some of them, can I flip them over to see if they close, or just replace all of them? I love your videos,AWSOME videos

[@DangarMarine]

I would replace them because if they break from fatigue cracks they will get sucked into the engine and you don't want that!

[@daveyt4802]

Try to pull a vacuum from the inlet side. Watch the carbs when it's running? Where is this filmed?

[@adrienjoinette8913]

I agree that a systematic approach to trouble shooting is the only way of making sure that all the bases have been covered and yet still it can leave you scratching your head, I can relate this to an MD who's patient is displaying a multitude of symptoms which can some times lead to a totally unexpected problem, definitely engine repair requires clear thinking, persistence and a ton of patience, all words I know but can't relate to LOL

[@DangarMarine]

There are definitely some jobs that leave you scratching your head, that's for sure. We've got plenty of things to check on this outboard yet though! ;)

[@pacman4568]

I have an old Salva 30hp 2 stroke it's hard to start in the cold and runs a bit lumpy when cold. After it's been running for a while like getting to a fishing mark, it will start almost ever time first time after that. The carb air input valve has no filter box on it, that's how I got it should I rig up a filter using some sponge. What do you think?

[@DangarMarine]

Many outboards don't have a filter box due to the lack of dust on the water like you get on the road. If they do have a box it won't have a sponge in it. The cold start problem could be a carburettor or reed valve problem so I would look at both. I would also look at whatever cold start enrichment system it has.

[@Sammyj12991]

I have a 15hp with no compression. What could cause loss of compression? Do you have a video that talks about replacing piston rings?

[@DangarMarine]

Depends whether it is a four stroke or a two stroke. If it is a four stroke then it can also be valves. I have an early video on doing the rings on a Yamaha and a more recent one on building the pistons on the Evinrude 150 I rebuilt.

[@kobiisrael10]

I would be happy to receive your help on a problem I have with the carburetor as soon as I start the motorcycle I have a leak from the excess pipe I did a test and all the signs indicated a problem with the float or the valve after countless attempts that failed to solve the problem I decided to replace the carburetor and after the replacement the carburetor was on another motorcycle And it was normal. But my motorcycle again had leaks from the excess pipe, do you have an idea or a solution to the problem

[@jacobbrown9114]

This video kicks ass. Great video man!!!

[@johnmccormick4055]

I want to put to 9.9 mercury out boards on a boat what distance should they be apart and should one out board mother prop turn Antiy clock ways and thank u for letting me know John

[@DangarMarine]

The further the outboards are apart the better really as they will get cleaner water and give you better maneuverability. Counter rotating props are good for balance but I'm not sure they warrant all the hassles that go with getting parts for them.

[@guyrivard6317]

Have been told that I have a reed problem (running remarkably well on 3 of 4 cylinders), but they are internal? as in not accessible like the video. Any chance you could one day show the difference between the two and how to access the internal reed valves. Love your videos! Thanks

[@DangarMarine]

Why type of outboard is it?

[@guyrivard6317]

Mariner (Mercury), 40HP, 4 cylinder, dual carb. serial # 0C200979. Bought it after it had been submerged, cleaned it best I could and it runs great considering. Guessing some debris might be affecting the reed valves on the non functional cylinder

[@guyrivard6317]

40 hp Mariner (Mercury), 4 cylinder, dual carb (serial OC200979). Was told that it is running on 3 of 4 cylinder by marine mech. He thought it was likely the reed valve

[@bonerjamz1000]

I purchased new reed valves for a mercury 200. When I put it back together I could slightly see light. Why would this be? They are brand new. I tried flipping them over both ways. Have you seen this before? Or is there a slight tolerance ?

[@DangarMarine]

Hmm, can't say I have seen that. They may bed in with a bit of use though but I would personally be feeling more comfortable if they were sealed before I put it all back together.

[@bonerjamz1000]

I looked in the manual and it says it has a tolerance of 20 thousandths. I took it apart and re checked it. It seems to be good now. Thanks! Love the channel

[@EvermontKing]

So bad compression can be linked to poor reed valves.. But how did I find which one is responsible? My 1988 force 50 hp has poor compression like 80 lbs

[@DangarMarine]

Bad reed valves won't give you a poor cylinder compression reading but they will stop the fuel and air being compressed in the crankcase. Often you will see fuel spitting out of the corresponding carburettor if they have broken.

[@DaRealGust0]

Will bad reeds cause a high idle upon startup?

[@TheCustomEverythingChannel]

Will the Reed valves cause an engine to have compression issues? This what I mean 1987 stratos fish and ski bass boat. Has a 115 mercury on it, new carpet, new seats and new cover. Boat guy told me it needs reed valves from losing compression. I don’t know anything about them and do not need it. Will sale or trade, make me and offer.

[@DangarMarine]

Reed valves don't affect cyclinder compression, only crankcase pressure that then transfers the fuel up to the ports. Low cylinder compression is a much harder fix.

[@johnnyalbert9706]

If the reed valve was stuck open would you get zero compression?

[@williamkelley7654]

Reed valves do not effect cylinder compression so you should have normal compression even with a reed valve stuck open.

[@DangarMarine]

As William says, the reed valves don't affect compression readings. The charge is compressed very slightly in the crankcase, just enough to get it to transfer through the port to the top of the cylinder where the piston compresses it up to combustion pressures. If that is low it is still about the rings being worn.

[@keonfrederic1857]

Well well well, carbs were dirty and timing was off too so those 2 things would have had to be addressed anyway at some point right? Seems like the perfect nightmare issue, multiple problems...;) Great video! Can't wait to see the next one. Cheers

[@DangarMarine]

Don't forget the leaking head gasket too! ;)

[@keonfrederic1857]

yeah that's right i forgot! I remember chasing a similar issue on my previous motor. Replaced fuel pump, reeds, cleaned and re-cleaned the carbs, even replaced one pack, adjusted timing. Was driving me insane... The idle was getting a bit better each time but still not 100%. in the end replacing the shot (open) thermostat is what fixed the problem. Multiple or erratic issues are the toughest to fix.

[@TomSmith-qc4wk]

Hey Stu, did you ever find out what the problem was making the engine sneeze?

[@DangarMarine]

Yes, it was a carb synchronisation issue. I think it is the following video.

[@mikecarter2073]

@@DangarMarine So, I have an 85 Merc 18 with that same snort, but it only has one carb. Now what, reeds look good, I flipped them, carb cleaned several times, waiting on new gaskets.

[@soonexrepublican7556]

Hey Dingus. You can flip the read valves over and it will fix any seeping

[@DangarMarine]

Depending on the design you often can and see if it helps. If not they'll need replacing.

[@soonexrepublican7556]

@@DangarMarine Been watching you for a few years Enjoy yr show.

[@wackyspazthe3rd]

I'm really curious as to what the issue was ? I have a tohatsu acting the same way

[@jingjang299]

Hi , did you fixed that squeze noise ?

[@eacja03]

Hi mate I have a tohatsu 50 two stroke 2005 model don't seem to be Erving fully throttle full open only approx 3200 revs on taco and low power any ideas where to start with this one please and cheers for a great channel

[@DangarMarine]

I'd make sure it is running on all cylinder - check for spark and clean each carburettor. I would also do some research into the outboard to see if it has a limp mode that has been activated limiting the revs too.

[@eacja03]

Thanks mate great channel

[@johnmccormick4055]

hi John northern island here I want out two 9.9on back a boat OK what distance should they be and does one need to be rotating the wrong way thanks John

[@jimbogasoline8559]

John Mccormick ? You might want to retype you're question. It's hard for people to see what you're asking. Thanks

[@DangarMarine]

Yes, must say I'm a bit confused by this question too!

[@AntonioPerez-kk8cj]

Was the issue ever solved on this motor? What fixed the problem?

[@briangay5418]

Great video on 2 stroke operation! Great sense of humor as said below "Almost 100% not better" I've just come into a Evinrude V4 120. I've watched most of the Evinrude 150 videos you did which will help with this motor.

[@cadillacescalade1]

Dear dangar Is it true that if reed valves are flipped they will wirk fine?

[@DangarMarine]

Can't say I've ever done it, but I would be careful with the direction the metal has already been fatigued in if they are old reed valves.

[@michaelmitchell2313]

i have a 1975 black max will the heads off a 1976 fit

[@garthbaldwin9771]

Absolutely brilliant.. Super helpful and easy to understand

[@DangarMarine]

Glad it was helpful!

[@fishin360]

So I have a 1987 9.9LH. Should I premix the fuel at 100:1 or 50:1?

[@alangrant5278]

Aw mate I love the ammo box panniers on the bike. I did the same on my Yamaha. There’s always something interesting on the background 👍

[@bigobetancourt7493]

Thanks for the diagram explanation.. my 90 hp v4 evinrude I have to choke the crap out of it to make it run. I'll run super for as long I want to be in the water , ! But whe I turn it off and let it sit for more then 1/2 hr I will kill the battery trying to get it started again. I took the plugs out and choke it to make it run and it takes at least 15 mnts of cranking with full choke to start it again and then it cuts off. It's like it's not getting enough fuel into the cylinder? Can reeds cause that.. thanks

[@jazldazl9193]

If it takes more than 20 secs you are beating a sick donkey