I have a 06 650 v2 cat ther is a grinding noise when im in 4x4 only when im givener in mud it makes no diference whether the diff lock is engaged or not it sounds like its coming from the transfer case but not shure . it dose not make noise when im riding normaly just when the tiers are spining any body have any ideas what it could be

 

Sometimes a grinding noise that sounds like a steel ball rolling around in a metal circular pan? It is like a whoosing grinding wirring noise. You normally hear this if its a bearing or such. If your ATV is still under warranty I would take it back in and have the dealer look at it. Can you put the wheeler on blocks all the way around and hear it as well?

I am pretty sure your 650 is an auto and the auto tranny sometimes makes a whinning/humming noise that surges as the tires get and loose traction and does not do this when traveling down a trail unless you are spinning the tires. This is what my 500 TRV does. AS far as I know it is normal.

I am not 100% sure but I know there was a recall or an issue with a thrust bearing (or something like that) on the AC 500. It would be worth a call to the dealer to check it out anyway.

Hope this helps.

SJ

 

thanx for the reply im shure its a bearing I went for a ride the other day to see if I could hear it again and I notesed oil coming out of the breather for clutch housing I havent taken it apart yet but im shure a bearing went and the oil seal followed