I have purchaced my son a newer sled and have inherited his 2003 Polaris RMK / 144". The sled has been well maintained and is reading about 2000 miles. I have heard a few people say the RMK's will have crankshaft issues at 2000 to 2500 miles. Is this true, and if so what needs to be taken care of to avoid further problems ? Are there any other troubled areas I should be aware of ? Your help is appreciated.