Ok I have a 2005 Skidoo 600 HO carb motor with 7050 miles on it. I bought new and have always ran amsoil interceptor full synthetic oil and premium gas, I have had zero problems out of the motor or sled for that matter. my mechanic is saying I should rebuild the motor to "freshen it" I guess I always heard if it aint't broke don't fix it. What kind of longevity should I expect from this motor? I do plan to keep this sled and would like to get 10,000 miles out of it. I am a trail rider not a racer but do open it up when the trail is wide and strait. What do you guys think? rebuild? or keep riding?