Yamaha 40 HP Carburetor fix

[@timsaloify]

My 40hp Yamaha ran like crap for years. It's been getting worse every year. I tried everything (clean carbs, plugs, valve timing). I was about to give up and buy a new motor. I knew it was a carb issue. Cleaning helped but it never solved the hesitation problems. Decided to give this fix a try. It now works great. Thanks for the video!! It really helped.

[@rickforstall537]

My 40hp would barely run and carbs were cleaned, I did the jet swap out and now it runs awesome, balanced the carbs and popped in new plugs and now it just purrs. No more cold blooded starts either! Thanks for info. Rick

[@davecoutts7393]

2002 ran bad rebuild it 5 times did you fix ran the best I can every remember today idling for hours and about 4.5 miles per hour faster 25.5 mph on 16 foot SSV lund thank you feels like a new boat

[@danielcollins531]

I just took the next size drill bit and made the holes bigger in my 40hp jet drive and it runs great now !!!!!!!!

[@AlfredMontaner]

That's awesome!

[@thetexan8365]

I just got a 40 hp 2 stroke and it's not idling like it should, do you think if I did the same this as you did, it might fix the problem?

[@DR_Hopegood]

I’ve got the same motor but a 2008. Running rough and seems to be starving for fuel. Removed jets and cleaned them with compressed air; all jet ports are clear. Still can’t seem to get it to run smooth. Thinking of trying the oversized jets.

[@danielcollins531]

Man im proud of all these videos they are verry helpful!!!!!!!!

[@TheEngstfeld]

I have a fifty hp. It runs great so long as one condition is met. Only use NON-ethanol gas. Violate that rule, and let it sit up any length of time and you’re screwed. I had the carbs rebuilt and followed this rule and even stored it for a year. It cranked on the first try and ran like a top. Then a cheap ass pendejo nephew ran ethanol thru it and it’s back to having the high speed jets clogged.

[@himsohimsom-be7fh]

Why year is your 50 ? Same problems I could use some help

[@Bigtime_mcalpine]

gonna try this this week. I have same problem. Idles fine but bogs down when cranked.

[@AGuyFromHazard]

I have a 2000 mercury 40hp 4 stroke with the yamaha powerhead and carbs. The belows on my accelerator pumps are torn and i cant seem to get the rod out to replace them. Any advice?

[@LisaMoses-t4s]

Quick question. Just did the jets on my 05 40HP Yamaha do I need to adjust pilot jets before doing the sync ? Can’t find out anywhere. Thanks

[@scottbaker3776]

Yeah did the same to my f40 4 years ago...runs perfect

[@SouthFloridaFishingClub]

Did you only replace the Jets in the top carb or on each of the three

[@eggrolll]

​@@SouthFloridaFishingClub need to do all 3

[@МаксимИванов-в5с8н]

Hello. what is the difference between yamaha f30 and f40 carburetors? just the jet diameter? Or different diffusers? what is the diameter of the diffuser on the f40?

[@kenkirby928]

Did you do all three carburetors with it Jets or just the one

[@apalplnh2112]

what is the Membrane Carburateur can past to my yamaha cygnus x 125cc 2006 PLZ plz

[@kfenne]

Hi! How do you disconnect the linkage from the three carbs. It looks like the same as on my Mercury 40, but I can't figure out what to do with the vinyl "washers" that connects the linkage and the carbs. There is no locking pin at any of the three carb connectors

[@AGuyFromHazard]

I have a 2000 mercury 40hp 4 stroke. I took my carbs off and separated the linkage from each carb by just popping it off the plastic clips that hold it to each carb just make sure you don't lose any if they were to fall off. I know this replies late but maybe it will help someone else

[@DR_Hopegood]

Wonder if the fuel pumps on these things have issues. Read somewhere that the fuel pump should last for years. Verified the check flapper valves inside; they look fine and are sitting square over the port.

[@ic1886]

Con cuál carburadores son compatible mas

[@marcoaurelio9879]

good afternoon, please which initial adjustment of the carburettor air bolts, on yamaha 60 fed thanks

[@Lamar4ya]

Can i put a 40 hp. yamaha carburetor on my 25 hp yamaha four stroke for more power?

[@michaelsantos1678]

I have a 90 hrs power yamaha.. and i would like to do the same when i open my carburetor... can u help me pls...when i do the upgrade.. maybe a site i can visit to see the proper size # of jets.. thank you...

[@AlfredMontaner]

It works on a 40 horsepower I cannot make any recommendations or suggestions on any other model or horsepower. And always remember it is done at your own risk.

[@michaelsantos1678]

Alfred Montaner thank u.. just want to find out who has done it.. cuz i like to take that risk

[@cobia1794]

Same motor, #2 cyl does not fire at iddle. Have compression, and spark, when a cleaner is sprayed into manifold port if purrs like a kitten! Cleaning carb now, not sure what passage might be the issue?

[@AlfredMontaner]

+Cobia 1 I upgraded the Jets and no longer had the problem. Those carbs are delicate.

[@cobia1794]

Well I looked at the idle jet again and ran it through the sonic cleaner, made a big difference in the opening. Had some butt cheese in it... I'll try that in a day or two. Snowing tonight.. But thanks for the reply and advice!

[@AlfredMontaner]

+Cobia 1 let me know how it goes

[@cobia1794]

Alfred, I finally got it back together and found the idle jet was completely plugged. Ran it through the sonic cleaner, put er back together, runs like a champ! No need to upgrade the idle jet. I'm at 4,900 feet elev. here where I live, and runs great, need to get the sync gauge and balance to finish up!

[@AlfredMontaner]

+Cobia 1 send me a video of her in the water [e-mail]

[@havnt3782]

did you just clean the old jets or did you buy the kits for the 40 carbs that comes with new jets?

[@AlfredMontaner]

Bought new jets

[@andydennis2525]

Did you blow up this motor yet? Being serious getting ready to try it

[@AlfredMontaner]

It works

[@thetexan8365]

I just bought a 16' Achilles with a 40hp 2 stroke, ran great the 1st day out but not won't stay on idle unless I have the choke half way out. I'm thinking I might have to do the the same thing as you did. It's such a clean motor, the kid I bought it from really took care of it so what ever the issue is I'm sure it's a small one. Sat for a while so it probably sucked some crap into the jets?

[@AlfredMontaner]

Yeah those jets are problems that's why I did this video the upgrade actually works

[@thetexan8365]

@@AlfredMontaner Cool....looks like I have an upgrade in my future...thank you

[@ic1886]

Tengo un motor de esos pero quiero saber si puede adaptar otro carburador

[@bachdaddy8683]

Did you back the jets out at all after you tightened them down? I think it's that or a float is stuck cause I'm leaking gas out of the carbs

[@bachdaddy8683]

I did the same swap

[@cuba802able]

will this work on 02 yamaha 50hp 4stroke?

[@SoundToaster]

I have the exact same motor. When I run it in neutral everything is fine, but as soon as I put it in forward gear and give it gas after it stops I check the timing belt and it is off by 3 or 4 grooves. The timing belt is brand new and fits tightly. The other thing is when I run it out the water on the ears and accelerate the motor runs good except for the timing belt problem. When it is ran in the water I can’t get it to half throttle until it starts to bog down. It only bogs down like when submerged in the water. Any ideas on what it could be?

[@AlfredMontaner]

+SoundToaster sounds like the Jets are still dirty that's why I upgraded to the bigger Jets

[@SoundToaster]

Alfred Montaner but it is weird that it bogs down only when submerged in water.

[@AlfredMontaner]

+SoundToaster whenever you put a load on it that happens. Those 40s are Infamous for having carb issues

[@digitalme4404]

could be carbon build up in the exhaust. when the prop is submerged it creates back pressure in the exhaust stalling out the motor

[@castawayfishing4568]

Hey mate mine is doing the exact same thing. Did you ever find out what was wrong?

[@kenkirby928]

Thanks for the video and thank you very much for the reply what I'm looking for is the number three carburetor the lower one A friend of mine had bought a 2004 four stroke 40 horse Yamaha and the guys took advantage of him right at the start unfortunately I wasn't here to help him go check out the motor I was out of town for a few years but anyhow and didn't even sell it to him with a prop and the guy I'm talking about is disabled he's on a walker he's got killed himself in his pickup truck and the guy just took advantage of him and he put the motor on the boat and start having problems right from the start and the guy wouldn't stand behind it so he got other people to work on it and then I come back in town and I seen him he asked me if I look at I did all the bolts were loose on all the carburetors social carburetors off and look at them and they are all full of hazy white scaly stuff except for the number three the bottom one it was just full of water and just hard and rock crap all over so I need your number three carburetor and I do thank you so much for your reply and keep up the good work

[@benaliabdelhake9549]

Friede sei mit dir. Ich habe ein Problem mit Benzinlecks .yamaha 40hp 4storek

[@KeithBunyan-b9j]

I am be check on one

[@ThatBoatGuy]

I bet you saw my video on this lol

[@AlfredMontaner]

💯 percent ! Glad to see your getting into the rib world. Remember if you're not on a rib it's a sinkable Boat !

[@ThatBoatGuy]

I used to have one. They get dirty too fast lol.

[@AlfredMontaner]

The dealer swore I was gonna blow the motor.If you see the Last video of the ab restoration it was flying. kzbin.info/www/bejne/ppfPlp2YfbxnaJI

[@ThatBoatGuy]

Alfred Montaner lol screw the dealers. They want you to buy a new motor from them.

[@AlfredMontaner]

If you're ever in Miami hit me up I will take you rib fishing.

[@SoundToaster]

Does this engine have a carburetor bowl and if so where is it located?

[@AlfredMontaner]

+SoundToaster it has three bowls one for each carb There's another KZbin video should have a rebuild of this particular card I believe his name is Eric edic

[@SoundToaster]

Alfred Montaner thanks for the help

[@AlfredMontaner]

+SoundToaster 😜

[@jimmasin6748]

That motor shakes.I am familiar with those engines.That motor sounds like shit 2.I can show you what a properly tunes 40 looks like.You can put a cup of coffee on the engine and it would not shake off.The problem is where the plunger and spring lay in the bowl.I never put different jets in those carbs.All they need is a proper cleaning and the plunger varnish is a must do service.

[@AlfredMontaner]

+jim masin send me a video of the 40 you tune up with a cup of coffee on top. Make sure there's Folgers in your cup!

[@jimmasin6748]

Dude I built 100s boat engines gas engines my whole damn life sold 100k muscle car restorations.I don't have time to argue.Here is a good example on you tube.Clean your plungers and buy a good ultrasonic cleaner used off Ebay .kzbin.info/www/bejne/q56Zl6xsebR5l6c

[@attilacseh3406]

So smart running it without water hose attached lol