Yz250 2 stroke 1994

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3/4/2018 5:37 PM

I went over a jump and the bike whisky throttled on me. I had let off the gas. My throttle is to sticking it snaps back normally. My buddie seems to this it’s this gasket that blew out and is sucking in air. I started the bike after I had to lay it down. Starts up. I I reved it a few times everything was normal I did it again and it started to rev out of control and I had to power down any idea?Photo


3/4/2018 5:48 PM
Edited Date/Time: 3/4/2018 5:49 PM

Air leak. Look at the carb boot for the leak. If that is ok, then look other places.

Paw Paw


3/4/2018 5:57 PM

Ok thanks could it be that cylinder head gasket? In the picture. It’s ripped


3/5/2018 4:10 AM

That's the power valve cover rubber seal, not your problem, but will allow dirt/water in, silicone that up....check your Reed block/ boot for cracks, base gasket, crank seals....


3/6/2018 5:48 PM

I owned a 95 in 95-97 and I was always jetting for changing conditions. Those bikes are pretty durable. I only once had a problem & I caused it. I pulled the carb out so many times that I put a tear in the intake boot that attaches to the reed cage. Similar sypmtoms...I think PawPaw is right.
Considering those bikes are 20+ years old there can be a lot of dry rotting parts.
Good luck.