??? My '99 ZL600 (carbs) is showing some substantial wear on the track drive sprocket. Occasionally, I get a 'chatter' coming from somewhere near the track driveshaft, but I havent figured out what it is. I think it may be the driveshaft bearings (the shaft that goes thru the track sprocket). The sled has 2500 northern miles on it and is in otherwise perfect condition. I just dont need any breakdowns and would rather replace the parts now to prevent this. Has anyone replaced the driveshaft bearings (if that's what they are called) and is it a big job? I think I'll replace the drive sprocket too. Any/all comments welcome - thanks in advance!!