[ZRJoe]

The ONLY thing I can think of is that the belt might be sticking to the drive clutch. Try removing the belt and leaving it inside until you go again. Replace the warm belt and then try it.
I had that happen a few times when it got REALLY cold -30c but that's because the belt is shaped like an oval and it grabbed on a edge.
Other than that it doesn't make much sense unles you clutch bushing are worn. the sheave may not be opening all the way when you shut down and when you start cold the weights slam early. ( Maybe? )

 

[94ZR580]

Maybe try using a stand for warming up the sled. This way the track and belt can loosen adn begin to warm-up without being under load. It is allways good to raise the track off the ground when parking the sled anyway and if it can make it easier on the clutch, belt and track then I think it is a good deal.

 

[SnORaCeRZR440]

Ya Im gonna get a stand for the sled, Im also gonna try the "warm belt" method ZRJoe spoke of. It does seem to do it only in very cold weather like Joe said (recently when Ive been riding it and having the clutch engage early its been about 10-25 f outside).

 

[deanm]

Just for giggles...

Take your spare belt and leave it on top of your sled outside overnight. Try to move the belt in the early morning and notice how hard it is to move. Now think of your track...same thing. Using a warm up stand and a warm belt will keep you belt lasting thousands of miles instead of hundreds. Make sure your clutch sheaves are also free of condensation too. lol