To this day, still the best educational outboard videos out there! Fixed my "Sneezy" motor problem as well!

Finally found the solution to my sneezy 25hp yamaha. I would definitely put Yamaha in the title, as there arent any other videos for

That's what my Yamaha 40 Hp was doing when I bought it used. Did the carb clean, fuel tank, lines, plugs and still was the same. I saw this video and noticed my butterfly valves were uneven, checked my linkage that controls them and notice that they were upside down. So the entire time all I had to do was flip the linkage. But your video made me check those valves, and sure enough it was so simple to fix. Thank you so much from Victoria B.C. Canada

...an excellent teacher. Thanks for all the time you put in dangar stu! Subscriber forever!

This is the best or possibly the only video how to cure a sneezing Yamaha 20-25HP outboard engine! My 25HP Yamaha from -93 did exactly the same sneezing thing, and it's now running like it was new, thanks to your excellent instructions! Thank you for posting this! I'm truely greatful for your efforts! Also your video about tuning the fuel screws at idle helped me get my motor running like a charm! From not being able to go hardly anywhere with the boat, I'm now able to actually make longer boat trips with the family! :)

Awesome video!! Thanks for sharing, love this series. I have been using them to service an old yammy 20hp and the motor is now running great!

Thanks for the acknowledgement. I appreciate it. I tell my customers to watch your vids if they want to learn a little about outboards. Keep up the good work.

The joys of being a mechanic, is that we learn something new every day, and we need to be open minded, as I have learnt how to fix issues from the strangest people.sometimes the old bush mechanic can teach us a thing or two Good work well done, gold coast Australia

Thanks Stu; What a thorough how to video. very easy to follow. God Bless.

great video just shows how much that can effect the running of it very useful

What a great series. Thanks for uploading, really enjoyed it

had this issue on single carb 25. literally the butterfly screw fixed it. cheers Stu. great video as always.

Love the Yammy 2 strokes,great motors n easy to maintain.

Very good series!! I am excited for the Johnson 40 videos you mentioned at the end- that's my trusty motor

Another awesome video, glad the motor is running

Been following your channel for sometime, really enjoy how you explain things.

Excellent video - this is exactly what I needed to know how to do on my newly acquired Yamaha!

Bought a 1981 Yamaha 55B and in short - I tried to make it run without success - watched many youtube videos - finally found this one - and a day later it is running. Thank you for to the point instructions. Waiting for 2021 boating season here in Finalnd.

My Johnson 110 was coughing and getting hard to start so I took the carbs off and cleaned them. Starts better but has a slight cough but not as bad so I’m going to look at the butterflies like you did and figure out the rest seeing the carbs are different. Nice video good details.

Awesome Stu, glad this one doesn't have a cold anymore. interesting carb setup on this one. my merc has less moving parts to deal with but the sync is the same. glad it was an easy fix and not a major one.

Awesome video! I truly appreciate your time in making these videos. Thanks!

Never in a lifetime would thought that! nice video , i'm very happy to see it fix

Great video. I’ve been sitting with exactly this issue on a similar model 25hp Yamaha. Exact same setup. Going to go through this and hopefully get rid of the sneeze

i loved this little series on the single outboard. Would love it if u made more videos of knowing how to diagnose issues then fixing them on that outboard, but also keep up the more specific videos separately. Loving all your videos

Great video, I enjoyed the whole series on that 2 stroke. thank you!

Presented in an easy to understand manner, as usual. Thank you.

Hey danger, can you make a video of adjustment in the timing on 25/30 yam 3 cylinder? There is not any video of these motors. Thank you very much man, you do a awesome job education people with your videos

As always, so informative. You just simply are the best

Great find. This is a prime example of why you consult a professional for repair. I would have went toward the fuel pump. It's your experience and knowledge that shines in these type of repairs that in the end costs less money because you know where to look and diagnose. Well done and great video!

Great video and very educational!

This is gold dust info to the learned outboarder like myself - Thanks 😊👍

Great diagnostic series 👍

Great information as always, thanks!

Nice work Stu.

Superb series of videos 👌

Great video.

Great series!

You are the best at explaining things..i always learn a lot from watching your videos. God bless bro.

Another excellent video and explanation, thanks Stu, John

This may come into use. I’m looking at a 1989 Johnson 25hp, the motor has that 2 stroke sneeze when the guy fired it up after it’s sat for a year. Compression is at 140 in each cylinder, new spark plugs. But on your previous vids of this Yamaha some things I would have never know to look for, so thank you!! I’d like to get a Yamaha instead, but here in the states they are a fortune used. Johnson and mercury is not to bad priced used. The average price for either of them is about $800-$1500 anywhere between 20-30 years old. The Yamahas used are between 20-30 years and they want $2500 or more. Supposedly there’s more parts for older Johnson out there than older mercs. We shall see.

So impressive you foundthe problem, im actually having the same problem but with a 15 hp mercury 2 stroke. just one carburetor though, which i rebuild, but still the same problem. I am working on outboards myself for over 10years now but never came across such a problem. It's true that 80% is a dirty carburetor, but this is just insane. I got a vacuum leak via the butterfly axle and mechaniced the shit out of it, blocked one end off and an 0-ring on the other end so it leaks no more and handles exactly the same... this is just insane.

Great job. Keep up the good work.

This video is very helpful to me right now!big thanks.I just cleaned all 3 carbs and each carb has 2 floats it’s more like 6 carbs!now it’s time to sink them all!Ill keep watching this video a few more times 👌👍

DAMN YOU !!!!! Your videos are so good, I spent another 2 hrs on this damn computer!! I don't know if I should hate or love you. I'm confused but I know one thing for sure, I wish I had a shop instructor that was half as good as you. Please keep up the videos, we need people like you.

Yamaha has this problem, and it was also in the RD-400 engine, sync the carbs or it won't loft the front wheel. My family saw me riding that bike several times, my old man remarked about only one wheel being used at any one time, I think that is why two strokes were discontinued, it wasn't about emissions. I had fun with that bike, I also really liked the Kawi H-2 triple two stroke, that thing was a screamer. That H-2 went 11,500 rpm in third at well over 90 inside the school parking lot. The RD handled, the H-2 went well in straight lines. H-2 didn't turn worth a damn.

Was really expecting the manometer to come out for this one. Really informative video, thanks.

I enjoy your videos!

amazing videos man !

Thanks Stu.

I have a Suzuki DT 55 that shows exactly the same issues. I also know that the center carb throttle plate is fractionally ahead of the other two. Stupidly I hadn’t considered this to be significant enough but I’m ready to get at it. Thanks, I’m feeling more confident that I may finally solve the sneezes.

I knew it lol. Actually I was expecting the bore of one or both of the carb butterfly shaft(s) to be worn. It still great showing how diagnostic leads a person around like that. I once as a teen rebuilt a car engine because I thought I had a head warped.. Turned out a line to the turbo after all of that. No worries though because it really was due at 230k miles I guess.

Great video. Big help.

Nice work Stu, Beer time!

wow, had no idea carb synchronization could cause that lean sneeze condition. I was getting anxious when your last few videos didn't find the issue!

i have a yamaha 40hp 3 cylinder from 1986 with this "sneezing" problem on the third cylinder, it revs up fine but at lower rpm and idle it sneezes. carbs are clean and reed valves looks good

great video as always...can'twait for the 40 johnson....love the evinrude johnson omc motors....just can't kill them

Hi Stu, my oldest son has a small older merc 2 cylinder 110. I think it's a 9. something hp. he brought it over for me to help him change the impeller but has other issues. I will gopro this week for fun.

I’m going to go try this on my 78 115hp Evinrude tonight. She bogs spits and dies at low idle. Cleaned the carbs and found rubber under the float needle seat AND low speed jet was plugged with the same type of rubber. Was leaking fuel all over and wouldn’t start. After the carb clean, new fuel pump, new fuel lines the motor now sputters and dies. Hoping it’s just a loose connection like you show here. I think I remember looking into the butterfly chamber and saying to myself “ hmm it’s not closed all the way AND it won’t open all the way”. Didn’t do anything about it cause I didn’t see this video yet!! Thank you. Hope this is what fixes “The Little Bogger”.

thanks

It seems like the smaller the motor, the more important it is to have the carbs synchronized. I know its bad for all motors but seems there isn't as much wiggle room on the smaller motors. Great job as always Stu!!!

Bloody excellent series of videos - if only I had access to material like this back in the 1980's when I had my boats. What did we do before the interwebnet, eh??

otimo video, muito obrigado.

Thank you Stu, I was eagerly awaiting this video. More good work. Greatly appreciated. I will be down your way in a month or so, where is your workshop, is it at Brooklyn, I am thinking of paying my debt for all the info. Cheers, Bruce.

Great, I still don't have a specific date yet but will let you know in due course.

Thank you for the information. Great video as always. Do have a question. Should you tune the carbs with the air box on or off?

I’ve got a 40 that’s sneezing badly so fingers crossed this helps

this same this is happening to my Mercury 40hp 2 cyl. 1 carb.. cleaned carbs and fuel lines, same spark plug issues, same "fix" when one wire pulled.. but I only have one carb..

grate video Stuart any chance in the future of a video checking four stroke valve timing

👍👍👍 you rock!

Hey Stu, another great and well made video!!! I am trying to understand how the "out of sync" carbs could have this effect on the motor!?! Obviously it did but can't comprehend fully. Haven't seen the Green Machine in a while, all good I hope. Cheers

last thing i would of thought of how ever good tip to know.

I have learned so much by watching your channel! thank you Sir. I have a 50 HP Yamaha 2stoke that keeps getting clogged jets. almost immediately after cleaning. I have replaced all fuel lines, filters, fuel pump, and ran it on a separate fuel tank. My next step is to replace the spaghetti gaskets or orings inside the carbs. they have some type of gel stuck to them. it was like this when I bought the boat. have you ever seen these gaskets cause this type of problem?

mate why didnt you just sync the carbys in the first place ,,,,JUST KIDDN,, loved the video,,always so informative,,,one of the best videos,,,please keep up the fantastic work...I did have a problem with a slugesh motor,,it was a leaky fuel pump diafram...hopefully we will meet one day as i fish near were you live...take care friend.....cheers Brett

stu you're the man if you were a little bit closer I would get you to work on my motor but I'm all the way in the US

In this series I learned so so much. Its 1 a.m. and its worth of being so tired. But I couldnt stop watching all the episodes around that little 2 stroke.

Good job I was going with the left tire next time. Peace tight lines and be safe out there.

Awesome Stu. I had no idea that these engines were that sensitive to carburetors not synchronized perfectly. I definitely learned something from watching this. Is it possible to remove the carbs for cleaning and not disturb the sync settings?

Dam good video ,

Well, that was easier than I thought it would be. I figured you would break out a mercury carburetor sync tool. But then, I didn't see any vacuum tube ports on the sides of those little Yam's carbs to attach the tubing to.

great video :) u planning to do any videos on the tohatsu 50 2stroke automixing? heard they are similar to the yamaha autolube "series"

Hey Dangar Marine .. Your videos are really good ive subbed and subscribed..I Just came home from doing a link and sync on a F150 at YAMAHA MARINE UNIVERSITY in Atlanta USA and my question is that the instructor told us that it would be best to do this in the water or a very least in a bucket.. I was just curious is it would make that much difference with a load on it.. We had to adjust the TPS to Meet the ISC request at around 42 degrees. THanks for you videos again. MiKe.

Just did this to my old Yamaha. Stripped and cleaned the carbs, they always needed damp start to get it going. Put them back together exactly as they were, started it with no damp start (yay) but had this same issue. Followed this video, brilliant, fixed it. Cheers. One question, is it wrong that it runs better with one of the mixture screws screwed all the way in? The other one is 4 half terns out at the moment. Thanks again, brilliant instructions. Keep em coming.

Have you ever dealt with envinrude Lync and sync? PS Im happy for you that you are now back in the summer season

Your vids are so addicting I binged-watched this yamaha story... and I don't even have a yamaha! But it did bring up a question for my 1995 200hp Evinrude. In order for it to run smoothly, all six carb screws need to be backed off 6 1/2 turns. Seems excessive but it's the only way to get her to run nicely. Think the amount of screw turns are affected by something else so I can save some fuel? Thanks for the knowledge.

thanks so much for the lesson. question: At 8:20 you say motor is hard to start, so you add more air by opening the butterflys. Isn't a closed butterfly the same as a full choke, which makes it richer and easier to start? And what is the choke mechanism? Obviously it worked, but why? Motor was warm from many video takes?

Awesome video as always! If your fuel pump automatically mixes both oil and gas (VRO pump), what is a good way to test the mixture is correct and the VRO pump is working correctly for both oil and gas? Can you pull fuel from the bowls and somehow validate the mixture?

Dangar, are you still posting material on the web? Really appreciate how you explain things. I have an Evinrude VRO 140, and I think I have a carburetor throttle linkage issue. Wish me luck! thanks man!

ahaaa.... there IS balance in the universe...hang on where have I heard that before this week ??

I synchronized my carbs I have a 48 hp envinrude 2 stroke, when start it up does really good but next day when trying to start it up it off again wonder why.

Good day sir. I'm a fairly new subscriber to your channel. First of all I have to say you your videos have helped me tramendously. I have what I think is a 1988 90 hp 6cyl Mercury outboard with 3 carbs. I have rebuilt the carbs new coils, wires, plugs, compression on cylinders is 150 lbs almost dead on in each cylinder. Number 5 cyl is acting exactly the same as the cylinder in this video. The only things I haven't done that you have in this series. Is the head gasket, and the Reed valves. Before I do that. I wanna time the engine, and sink the carbs. My question is. Does the same procedure apply to my engine as this one. Would the carbs be adjusted the same way, and have never timed an outboard engine before. Any help you could give me, would be extremely helpful. Oh by the way great videos on the electrical set up on the green machine. Got my 76 Marquis wired up perfect thanks to you.

thanks that helped me big time if I was down there I would buy you a beer or two

What camera are you using that zooms so well

A quick question if you have the time, with my V6 2005 150HP mercury 2 stroke, I've noticed it has 3 carbs fitted but i'm assuming each body contains 2 carbs (so 6 all up) that I'd need to sync using this method ? I find your video's to be very informative and your method of presentation makes it easy to understand, and gives me the confidence to tackle this job. Also how would I know if my outboard was running rich ? is it simply by ensuring that the mixture screws are set to factory settings and thats it ?

great video quick question how do you synchronise throttle linkage on a 18hp tohatsu 2006

Done and dusted aye!

I have the same problem with a lean sneeze I have a 25hp 1985 single carb 2 cylinder I have changed carbs and still have a sneeze

Do these motors have a vacuum port, to sync that way - like you did in a previous video? I'm assuming no, but wanted to check. In the process of purchasing a service manual.

Hi Stu. could I use this procedure on my 40 3 cyl. yam. cheers buddy.

Thanks for the video Btw how is charly

Is the mixture settings the same for a 30hp (30D) two stroke Yamaha, 2016