1989 Yamaha Bravo

[510-Gem]

I picked up an '89 Bravo the other day with just under 2500km. I somewhat know the history of the machine and don't have any reason to believe it's a lemon or anything. It wouldn't be much of a loss if it was given the price. Anyway, we drug it out of a cold sea can yesterday and after a few primes it started effortlessly. The issue I'm having is it won't take throttle without dying right away. I can get the revs right up there if I prime it ever so slightly while staying on the throttle. I believe there's some sort of fuel issue here, and I'm hopeful that a good carb cleaning, particularly the idle or pilot jet will fix the issue. She really seems to want to go but something is starving the engine of fuel - at least that's my guess.

Any past experience/tips on this would be appreciated. These old machines can be great units but I know they can also be finicky at times...

[mediumrare]

Could b the pump

[Boogerfart]

1.How old is the gas,
2.any fuel filter,
3.Could be junk in the float bowel or jets, they're easy to clog,
4.pump diaphram may have pin holes,

Any of this is a cheap fix, start with easy stuff. How long has the sled sat since it had a good run?

[510-Gem]

Originally Posted by Boogerfart

1.How old is the gas,
2.any fuel filter,
3.Could be junk in the float bowel or jets, they're easy to clog,
4.pump diaphram may have pin holes,

Any of this is a cheap fix, start with easy stuff. How long has the sled sat since it had a good run?

Probably since this time last year. There wasn't much fuel in it so we dumped 5 liters or so in. Also added some gasoline antifreeze last night but not much changed.

[Bigwoodsman]

Take your carb apart and seafom all the pieces needle jets slide. You’ll probably find a difference. Those old machine are pretty basic and reliable.

BW

[lmtada]

Originally Posted by Bigwoodsman

Take your carb apart and seafom all the pieces needle jets slide. You’ll probably find a difference. Those old machine are pretty basic and reliable.

BW

X2. Main jet plugged. Main jet controls rpm from mid to top. Clean.

[Sooner]

Originally Posted by Bigwoodsman

Take your carb apart and seafom all the pieces needle jets slide. You’ll probably find a difference. Those old machine are pretty basic and reliable.

BW

I was given my friends older sled after he passed. Same issue, ran great with some quick start, not on it's own. Two carb dismantles, soaking everything, a good clean and runs tip top now. Drain any fuel, add some sea-foam and new premium to start after you get those carbs cleaned.

Well I didnt read far enough DOH. Belts don't stretch, they fall apart of give off stringy hair like stuff when they wear out, could be a clutch issue but I think your issue is still fuel related. Fuel pump could be your next check. Cracked fuel line, sucking air?

[Boogerfart]

Do you have a heated shop or garage to let it sit in? Would eliminate the condensation somewhat, when stored near empty they can get a surprising amount of water build up.

[Ennyindabenny]

Take the carb apart and make sure it’s good. A jet could be clogged, the floats or float needles could be stuck. Take all the jets out and run a wire through them to clean them out, spray isn’t always enough.