i was ridin on a lake today and made 4 passes down the lake to pack the snow and the strip was about 2.5 sledlengths wide. When i let it rip full throttle it only hit about 85 and max revs were 7880. The powervalves are clean and work fine, and the clutches seem to be shifting out. It is an f6sno pro with dd. Wondering why its is so slow? (my friend ran my 500xcsp next to me and i blew him away off the start but his top speed was about the same as me? help would be great and i ran a sharpie marker down the clutches and the primary has about .5in left so im wondering if the belt should go all the way to the top?