My problem is after trail riding for extended period my sled beggiens to bog, lose rpm, and will only run above 3/4 throttle. The problem has never came up while off trail riding. Temp on the trail never gets above 120, EGT's where around 1150-1200. The reason I am thinking it is the crank seal is because the pto side of my sled is covered in oil, I do have a leak comming from the VES housing but I can not imagion that amount of oil comming from it. So whats the easiest way to tell if I have a bad crank seal? Sprayed carb cleaner on it no stumble or change in the idle. Any help is appreciated, I am just about ready to jump ship to a doo, nothing but problems this year.

Thanks

02 Polaris 800, twin pipes, flannery porting, re-mapped cdi, kick ass filters, ect...