I have converted several Homelites. The Key is to reduce the resrictions in the muffler and put a larger carb on it, like 11mm. I just welded an exhaust pipe on the muffler, that really improved power. Also, the larger carb. My Homelite could usually turn an 18x8 over 7000rpm on the ground. Thats right at 2hp and 12 pounds of thrust. I found that putting a smaller prop on really did not help increase rpm that much, so I stuck with the big prop. Hope that helps-Lee