I have recently taken over my sons RMK 800 / 144". The sled currently has almost 2000 miles of use and has been well taken care of. I have heard these have some crankshaft troubles at arount 2000 to 2500 miles. If so what are the problems and what needs to be done to correct the problem ? Any additional items I need to be aware of with this sled before the begining of the winter season ? Thanks for the help.