ringing while idling

hey so after my bike had been sitting around for about 2 weeks and i started it up fine but when i was reving the bike in neutral i heard some ringing coming from the clutch box like maybe some plates had been worn or something. so i opened the case to inspect the plates and everything looked fine. i also checked the kick starter idle gear to see if anything was lose there and nothing was loose. so i made sure everything was in correctly including the torsion spring which was a pain in the butt to keep in it's hole and put the bike back together. i did an entirely new oil change including the filter started it up and it was still making the ringing noise....

 

any ideas to what it could be??? thanks

Model and year would be helpful.

 

And maybe a video clip so we can hear the sound.

Edited by woods-rider

Model and year would be helpful.

wr400f 1998

cant give you a video but it sounds like change in your pocket

without hearing it in person, initial feeling is crank bearings. really no way to tell without some investigation. Go buy a cheap harbor freight stethoscope and start listening to areas around the case, cylinder, head, etc.

your 100% sure its internals motor not external?

Probably something loose on the exahust

Make sure it isent something stupid like the top of the rear shock .locknut not tight .or shock bushings beat .hope its something like that .bill

your 100% sure its internals motor not external?

yup

Probably something loose on the exahust

no everything is nice and tight i had to take the exaust off anyways to get to the clutch plates

There is an intermediate gear between the clutch hub/clutch shaft and the crank shaft. The nut can work it's way loose and sound like jangleing change (Aussie change that is). You have to pull the R-H engine side cover to access it.

 

Had this happen on two of my Yamaha 4 strokes. The nut will not come completey loose as there is a lock washer (similar to the CS sprocket nut lock washer) that prevents this but it's still anoying none the less.

Edited by JDLowrance

i had to take the exaust off anyways to get to the clutch plates

 

What kind of exhaust do you have? This sounds very odd to me.

yup

no everything is nice and tight i had to take the exaust off anyways to get to the clutch plates

 

Huh??

i had to take off the header in order to take off the case


What kind of exhaust do you have? This sounds very odd to me.

i meant header sorry

bashplate?

Ya, agree with bashplate.  Let it idle and simply put your hand on the plate.  See if the tone changes.

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