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Old 09-13-2001, 05:59 PM
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Default YZ250 high rev.

My yz250 engine likes to rev up after it get's warm. I can't tell when it starts to do it until I pull the clutch after a while. It seems like something is stuck after it warms up?? Any ideas? It hasn't been running well lately either.

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Old 09-13-2001, 08:20 PM
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Default Re: YZ250 high rev.

hmm could be an air leak

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Old 09-13-2001, 10:10 PM
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Default Re: YZ250 high rev.

Air leak as in with the carb.?

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Old 09-14-2001, 01:03 AM
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Default Re: YZ250 high rev.

Yeah, she's a runnin' lean, man. Question is, where all d'ya figure it's coming from? Hey, maybe if you change your post signature to something a little more decent, your carb will start suckin' right, ardey arr arr.........

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Old 09-14-2001, 07:51 AM
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Default Re: YZ250 high rev.

if its a 250f,mine revs up too when its been idling over for a while,thats how i know its warm and right to ride.just back the idle off a bit if its too high with the black screwy knob under the carb.if shes a two banger it might have an air leak like the others said.look at crank seals and bearings,reed block and gaskets,maybe even base gasket or carb manifold.not sure if a header pipe leak might affect running.
c.u.

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Old 09-14-2001, 07:04 PM
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Default Re: YZ250 high rev.

I'm not talking a little bit higher rev. it runs as if I have the throttle pinched. It seems like something is sticking in the carb. I can drive it when it's like this but I have to shift very fast so that it dosen't have any time to start to rev up.

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Old 09-15-2001, 07:28 AM
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Default Re: YZ250 high rev.

maybe your throttle cable is stuck....or maybe its the floats...in your carb maybe they are stuck open. Take the carb off look at it completly and check the floats and everything. Maybe the jets are off. Check for air leaks like everyone says

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