[Tommy]

Blykins,
I never had my HP tested. I'd guess 400-425 at the wheels.

Madmonkey,
I used to fly for the Air Force, and after every flight I'd have to note any problems with the airplane. I was taught early on to not try and diagnose the problem, just describe the symptom and let the expert mechanics fix it. ... If you don't know enough about clutches to properly diagnose it (and there is no shame in that), either start down the long path of learning such things, or get someone who does know such things to diagnose it for you. Otherwise you'll have to keep throwing parts at it until it runs right, and that can get expensive. ... Good luck.