Reving in nuetral

I have an 06 YZ125. The bike revs up while in nuetral as if the throttle was wide open. Throttle cable and tube seem fine. Please help?

Could be an air leak.

Crank seal

New problem. The bike will not idle!

Crank seal got worse

What would be the best way to check that?

Crank seal
Crank seal got worse


To the OP....a leak down test will let you know. If its revving high, most likely the ignition side seal.

Finally had time to fix the bike. Replaced the top end bike runs great, problem solved.

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