Grinding noise when accelerating?!?!

[Bender_44]

Just noticed a about a month back that typically after riding for a while, once i accelerate hard (more than 3/4 throttle) i can hear a grinding noise that seems to be coming from some where in the tunnel (moreless under where i am standing). Not sure if this is the sled transfering to the back and the track is rubbing up against the ice/snow built up in the tunnel or if it is something more serious? Is it possible for the drive piece (dont know the name) that drives the track could be slipping? (i am really clueless when it comes to this, i have asked around to other buddies riding nytros and no one seems to know what it is.) Im hoping that i can get some feedback and fix it myself, otherwise off to the shop for another dent in my wallet...

 

[GHLYAMMY]

Sounds like your tracks ratcheting. tighten track.

 

[canoehead]

Check driveshaft bearings.

 

[sgilbert]

reach up under tunnel to feel drive shaft bearing on speedo end. if blood runs down your arm, needs the bearing

 

[SteelerJim]

Your drive chain tension bolt could have backed out or need adjusted