My 1996 Polaris XLT 600 Touring has about 3000 miles and now has ZERO compression in each of the three cylinders. Is this typical of the model and year? What can I check easily that will indicate the problem? Could it be the crank? Should I try to rebuild or drop in a used engine? What would a sled that is otherwise PERFECT with WOODIES CARBS sell for with a bad engine?? Thank you for your help...