I just traded into a 2007 Prowler XT 650 H1. It has some issues that I am trying to work through and I really need some help. When I got it about 30 MPH was top speed, all it would do. Very little power on a hill. I read a lot on the forum and decided to check the valve / tappet adjustment... It was WAYYY off, I could have stuck a nickel in there. Getting them down to .004 / .006 took all the adjustment left in the adjustment screws. So, I guess I need a cam. Engine runs better now, a lot quieter, but still only 35 - 40 MPH, don't trust it to go up my usual trails yet. Looking for cam, do I need to look into other parts as well? Advice needed