jetting, again

[elbandtioCA]

what's the difference between the loose clutch basket and the worn cush drive?

[andrewsw]

Cush drive is the rubber fitting in the wheel that the sprocket slides into. Provides a little buffer to the drive train as you go on and off the throttle.

I think it's definitely a drivetrain issue. When you decelerate you load those parts up in the other direction and that's highlighting the problem.

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[elbandtioCA]

that might explain why it does feel a little jerky coming on and off throttle.  i thought it was the chain being too loose but i tigthened it to speck.  i still wonder it wouldn't make the sound at a lower rpm.  and it does make the sound while just holding steady at a constant throttle position, just more pronounced if you let off the throttle.

[Banditmax]

Cush drive is the rubber fitting in the wheel that the sprocket slides into. Provides a little buffer to the drive train as you go on and off the throttle.

I think it's definitely a drivetrain issue. When you decelerate you load those parts up in the other direction and that's highlighting the problem.

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Theres also a cush drive in the clutch basket. betwen the basket and the gear

[Chris H]

The clutchs do give trouble, usually wont go into neutral once in gear, if the cush drive has gone at the rear wheel you can usually see fragments of rubber over the rear wheel, are the chain and sprokets good, it aint jumping on the front sproket?

[andrewsw]

Theres also a cush drive in the clutch basket. betwen the basket and the gear

right. thanks!

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[gsxr400 racer]

sounds like cam chain to me the chain slackens when you roll off the throttle

[andrewsw]

I'm prepared to be wrong on this, but how the heck would the cam chain slacken when you roll off the throttle? I would think that the cams wouldn't carry enough momentum to do that. And it certainly wouldn't _continue_ to be slack. No way do the cams have more momentum than the crankshaft and pistons all put together.

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[gsxr400 racer]

proven fact that the cam chain tightens and slackens if your your auto cam chain tensioner would out live the chain

[gsxr400 racer]

Also wooba checking your throttle is bad for the cam chain sounds cool at a red light but hell why not just keep shutting of you kill switch as you roll down the road

[andrewsw]

hmmm... chain stretch, I suppose? Chain is slightly elastic and under acceleration, stretches, and then rebounds under decel?

I buy it.


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[gsxr400 racer]

 

[Chris H]

Everyone is comin at this from the wrong angle, the facts are that it nocks above 8000 rpm especialy on the freeway and up hill so the throttle is open and the motor undr heavy load. Carnt be rear cush or cam chain whip cuz the load is constant,but, we have jetting that seems wrong and previous cam chain tensioner problems,so it could be related to the mixture or it could be other worn parts related to the cam drive chain, thats if the sound is in the TOP of the motor,so this is where i would start,but, i would always go back to a good set up and then work forward again.