Two Stroke Motocross

Two Stroke Motocross Forum => Technical => Topic started by: Yzalex on July 14, 2013, 05:57:10 AM

Title: High rev, why?
Post by: Yzalex on July 14, 2013, 05:57:10 AM

Hey there, new to the forum.  I have an 07 yz250 that I just did a full rebuild on top and bottom end and now when I kick it, it revs quite high, kind of like there is an air leak, but can't find one. I am stumped why it is doing this. This was my first time splitting the cases, but have done too end lots and never had this problem. I don't see it being anything to do with the bottom end I don't think. It would be great if someone would have some insight for me

Cheers,
Alex

Title: High rev, why?
Post by: TMKIWI on July 14, 2013, 08:13:02 AM

Check the throttle cable is seated properly in the top of the carby.

Title: High rev, why?
Post by: Stusmoke on July 14, 2013, 08:22:03 AM

Quote from: TMKIWI on July 14, 2013, 03:13:02 PM

Check the throttle cable is seated properly in the top of the carby.

x2. check everywhere on the throttle cable, from the cable wheel on your handlebars down to the slide in the carby. If that fails my next suggestion would be an air leak somewhere that might have sneaked past you. Under the motor, maybe. Somewhere that the gaskets haven't sealed properly.

Title: High rev, why?
Post by: SachsGS on July 14, 2013, 03:17:48 PM

X2. Check your stator side crank seal and cylinder base gasket for leakage to be safe.