Anyone good with carbs/small engines?

"SaigaShooter - He's got an Impreza" (saigashooter)
03/30/2014 at 22:39 • Filed to: None

I have a 97 Yamaha Wolverine 350 that is having some issues, I spent the day replacing all the jets and gaskets on the thing, connected it back up to the airbox, engine and fuel, it turned right over and idled stronger than it ever has. I revved the engine and it sounded strong and even. Put the ATV back together and was about to go for a ride, started up fine, idled well, but when giving it more than 1/4 throttle it gets boggy and wants to die, this was the same issue it had when I took it apart for cleaning and rebuilding.

I don't suppose any of you know what the issue might be?

Have a Saab for your trouble.

DISCUSSION (9)

Bandit > SaigaShooter - He's got an Impreza
03/30/2014 at 22:41

Timing? At least with my Trans Am that was the problem when it had those symptoms. Not sure how similar bikes are to cars.

Zipppy, Mazdurp builder, Probeski owner and former ricerboy > SaigaShooter - He's got an Impreza
03/30/2014 at 22:43

Not too experienced with carbs, but I think it could be sending in too much fuel or too little. I'm sure there's an adjustment.

bob and john > SaigaShooter - He's got an Impreza
03/30/2014 at 22:44

if the engine was out and it was running fine, make sure u check the fuel lines from the gas tank to the motor. could be something clogging it. if not, check throttle cable for kinks and biking

CRider > SaigaShooter - He's got an Impreza
03/30/2014 at 22:49

Did you turn the gas on?

puddler > SaigaShooter - He's got an Impreza
03/30/2014 at 22:56

tighten the jets? also, maybe crap in the fuel filters?

i-do-strange-things > SaigaShooter - He's got an Impreza
03/30/2014 at 23:49

Needle jet. Idle has its own cuircuit. When you go from 1/8 up to about 1/2 throttle, the needle lift up thru the needle jet. ( brass tube with a bunch of holes drilled in it) The needle moves up a little (just off idle) and exposes the 1st hole-up a little more I exposes the 2nd set-etc. What happens is shit gas over the last few years goes away real easy. So what sits in the bowl turns to crap. Anything below fuel level gets a layer of crap on it. The holes are only apx. .020-now get a .005 layer of shit-that hole is down to .010. Now you try to use the throttle + its lean-popping + farting out.

Just spraying carb cleaner on it wont do it. A small wire-or torch tip cleaner poked thru the holes is the only thing that works.

Trust me—I've done hundreds. Worked in a bike shop 5 years-once MTBE came out, 80% of the jobs became carb cleanings.

SaigaShooter - He's got an Impreza > CRider
03/31/2014 at 10:23

Yes, also added fresh gas to the tank as it was drained to remove the carb.

SaigaShooter - He's got an Impreza > i-do-strange-things
03/31/2014 at 10:32

I did notice when I was going through it that the needle was on the richest setting (clip at the lowest spot on the needle), and I replaced the main jet that screws into the bottom of the main nozzle but I didn't remove the main nozzle as I thought it was pressed in.

I will take a look at this when I can get back into the garage again.

pfftballer > SaigaShooter - He's got an Impreza
04/03/2014 at 16:19

I was working on a Yamaha 125 four stroke recently with the same issue. It sat in the garage all winter and the gas in the carb went bad. I tried pressing hardened steel wire from a brush through the jets to no avail, they were crusted up solid. Took the carb to a friend at a bike shop and he had to drill the jets out.

http://www.amazon.com/Pit-Bull-CHIDB…

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