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Boat bogging down issue
Posted on 5/25/19 at 10:49 am
Posted on 5/25/19 at 10:49 am
2001 Yamaha 2 stroke 60HP. Boat started right up and idled great but as soon as you try to give it throttle it bogs down and can't get up. Went home and drained all the fuel then put fresh, changed fuel line, filter, fuel/water separator filter, added in sea foam, and put brand new spark plugs. get to the launch and same thing starts right up like a top but try to give it throttle under a load and it can't get up any ideas?
13
Posted on 5/25/19 at 11:21 am to kennahbra
Trash in one/all of the carbs.
Had a 90 2-stroke that would do similar if you let it sit and get gas gummy and trashy in the bowls.
Will need to remove carbs, get the jet out and clean it. Will work right after that.
Had a 90 2-stroke that would do similar if you let it sit and get gas gummy and trashy in the bowls.
Will need to remove carbs, get the jet out and clean it. Will work right after that.
Posted on 5/25/19 at 11:34 am to kennahbra
You did have the vent open right?
Posted on 5/25/19 at 11:37 am to kennahbra
High speed jets in carb. Might need to soak/dissolve the varnish. Spraying in carb cleaner probably won’t work. Assuming you verified tank is vented as another post already suggested.
Posted on 5/25/19 at 11:47 am to kennahbra
how old are the fuel lines and bulb?...
may need replacing...
may need replacing...
Posted on 5/25/19 at 11:51 am to kennahbra
I went through this same issue a couple years back with a Volvo Penta inboard. I thought it was an issue with fuel—changed filter, additives, flushed the tank, etc. It actually turned out to be an issue with the electric choke not working properly.
At low RPM there was plenty of air flow and fuel rates for full combustion. But when I would increase the throttle there wasn’t enough air entering the combustion chamber to produce power. Disengaged the electric choke and forced it open and it ran great.
At low RPM there was plenty of air flow and fuel rates for full combustion. But when I would increase the throttle there wasn’t enough air entering the combustion chamber to produce power. Disengaged the electric choke and forced it open and it ran great.
Posted on 5/25/19 at 11:52 am to kennahbra
99.9% it’s the high speed jet gummed up. YouTube how to clean carb on Yamaha outboard, get a can of carb cleaner and you’re set. I had same problem with a 15hp Yamaha outboard, watched YouTube video and had fixed in my backyard in less than a hour.
Posted on 5/25/19 at 12:03 pm to kennahbra
Take the bowl and float off the carb. Remove and clean parts # 20-23
Posted on 5/25/19 at 12:25 pm to kennahbra
Seafoam.
Had the same issue with a 90 merc 2 stroke. Get a separate gas can and put a gallon of gas and an entire can of seafoam. Mix in 2 stroke oil if you don’t have 2 stroke oil injection. You have to make sure you have the appropriate oil mixture. Seafoam isn’t oil.
Run it 15 minutes. Idling up and down periodically. Then let it cool off 15 minutes. Do that 3 Times. Then run it on regular gas oil mixture.
Mine ran like a new engine afterwards.
Before, If I didn’t hold the wheel completely straight, I couldn’t get it out of the hole.
Had the same issue with a 90 merc 2 stroke. Get a separate gas can and put a gallon of gas and an entire can of seafoam. Mix in 2 stroke oil if you don’t have 2 stroke oil injection. You have to make sure you have the appropriate oil mixture. Seafoam isn’t oil.
Run it 15 minutes. Idling up and down periodically. Then let it cool off 15 minutes. Do that 3 Times. Then run it on regular gas oil mixture.
Mine ran like a new engine afterwards.
Before, If I didn’t hold the wheel completely straight, I couldn’t get it out of the hole.
Posted on 5/25/19 at 1:01 pm to kennahbra
Carbs gummed up or bad fuel pump. My 40hp Johnson did that this spring and a fuel pump diaphragm fixed it
Posted on 5/25/19 at 10:24 pm to farad
quote:
changed fuel line, filter, fuel/water separator filter, added in
quote:
how old are the fuel lines and bulb?...
You might want to take some reading comprehension classes.
This post was edited on 5/25/19 at 10:25 pm
Posted on 5/26/19 at 11:51 am to kennahbra
Same thing happened to mine. Same year and everything. The old fuel lines they used had a liner that eventually degrades and gets sent to the carb and cloggs it up.
Posted on 5/28/19 at 4:37 pm to kennahbra
ok so I had some time to walk down everything from tank to motor...drained all fuel in the line then took motor cover off and pumped the ball....there is a hissing sound coming from either carb #2 or #3 can't tell. as soon as line is pressured up and ball gets hard it stops, boats starts right up and idles strong. What is the hiss coming from the carb? Im by no means a mechanic, but i did have all 3 carbs rebuilt last year, could it be a gasket that has now failed?
Posted on 5/28/19 at 4:41 pm to kennahbra
Power pack? Are you getting fire on all cylinders?
Posted on 5/28/19 at 8:29 pm to kennahbra
quote:
did have all 3 carbs rebuilt last year, could it be a gasket that has now failed?
Unlikely that a gasket failed. I will say that if you had the carbs rebuilt by the best shop in the U.S. last year your high speed carb jets can be clogged up now. The rebuilding has nothing to do with gas sitting in the bowl, evaporating out over time, and leaving a residue behind that will clog your high speed jets. Do you run your gas out of the motor every time you put it away for a month or two or three?
Normally you can see if you have a bad fuel line or a bad bulb if it is bogging down under a load by pumping the bulb. The motor rpms will surge and fall back... surge and fall back. This is a good indicator that you have a fuel supply problem. All the pumping in the world will not help clogged high speed jets.
You can also check to see if you have a bad gasket around the carbs by letting the motor idle and spraying starter fluid around the carbs. If there is a gasket leak it will suck in the starter fluid and the engine RPMs will go up. Clear as a bell when you do this. Some folks use propane or map gas but starter fluid works great. Just don't spray it around the intake. Use it sparingly with a tube in the spray cap. You can eliminate the gasket as a concern using this method Keep a hose handy in case of a fire but I have never seen starter fluid ignite doing this. If you have ever chased a vacuum leak in a vehicle this method is tried and true.
This post was edited on 5/28/19 at 8:30 pm
Posted on 5/29/19 at 6:17 pm to kennahbra
Disassemble the carbs and clean them
Posted on 5/29/19 at 6:40 pm to Passing Wind
quote:
You might want to take some reading comprehension classes.
yup...missed it...I'm actually pretty good at comprehension...when I read past the point of "2001 Yamaha 60"...
had a problem with one before and it was bad fuel lines...
Posted on 5/30/19 at 8:29 am to kennahbra
Good chance it could be your fuel pump. I’ve had a similar issue as yours and that’s what the cause of mine was. A way to test it is loosen the two mounting bolts and prime your bulb. If it’s leaking around it when doing so, the diaphragm is out. Easier and not much more to just replace it vs rebuilding it. Part number below, showing $38 on the site I pulled the number from. Good luck with it.
692-24410-00-00
692-24410-00-00
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