ringing while idling

[brandonmotocrosslife]

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

[woods-rider]

Model and year would be helpful.

 

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

Edited November 7, 2013 by woods-rider

[brandonmotocrosslife]

Model and year would be helpful.

wr400f 1998

[brandonmotocrosslife]

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

[redhurricane]

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.

[080]

your 100% sure its internals motor not external?

[FORMA MOTO]

Probably something loose on the exahust

[Billyboypaints]

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

[brandonmotocrosslife]

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

[JDLowrance]

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 November 8, 2013 by JDLowrance

[woods-rider]

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.

[FORMA MOTO]

yup

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

 

Huh??

[brandonmotocrosslife]

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

[jackiefresh69]

bashplate?

[DukeSilver]

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