I have had mine since new and had several computer updates done, have 2500 miles, had cracked front cooler, now use rear one , had new fuel pump installed tends to run a bit rich so added a boondockers control box , be aware lot of guys burning down running too lean using the box, about 1 -2 jet<no.-5 -10> in higher elevation, > sizes max on top end, , added can and v- force 3 reeds about it. Runs in the deepest powder as good or better than any other sled, a little heavy but in deep powder dont notice it. Even runs very good down the trail, handles the whoops and stuttter bumps very well. And in an all out drag race only a couple sled lenghts off the brand new sleds with shorter tracks. my 2 cents. Oh changed the clutching a bit took out steel arms replaced with aluminum and added max pin weight and changed springs ,now backshift awesome, dropped gearing couple 1 tooth on top and added a couple on bottom. I would say 2 major problems to check are front cooler and fuel pump, I am sure other guys may have had different problems than me