(While the following information provided by Black Magic Racing is aimed at Arctic Cat riders, it pretty much applies to all Comet, Polaris, Yamaha and Arctic clutches.)
There are some things on your sled that should be checked on and/or repaired before the season starts. One of the major components that should be looked at are the drive and driven clutches.
The big power and big torque of the newer sleds basically tear up the primary clutch. The weights in the clutch nowadays are so heavy, that one of these would equal the weight of both, three years ago. Only problem is, the bushing that is responsible for keeping the weight aligned and moving freely, is basically the same material used in the lighter weights. This is where you need to investigate.
Remove the drive clutch from the sled, set it on the bench, remove the clutch cover, (carefully), and with the sheaves in the closed position, lift and attempt to move the weight from side to side. If there is excessive movement, the weight bushings need to be replaced.