I am having trouble in very cold temperatures(-30to-40C). My machine will rev up to 6000 before things will start moving. I have the track lifted before I take off, I can get engagement at around 3600. After things have been moving for awhile everything is fine. It is not a clutching problem. I changed chaincase oil, it was very grey looking. This has helped some, but I am still having problems. Track tension is fine. Any suggestions? Maybe a bearing? I am in an isolated community in Nunavut, Canada, so I have to do all the work myself, and I know just enough to get by. I usually speak to my mechanic down south. The last we spoke he said start with the chaincase.