Klonger:

Why you want to take a pure decent sport engine and get rpm's? Like most OS engines, they are timmed for around 14,000 with a decent muffler. If you want go, get a Webera speed 55, add Jett or Nelson pipe, break in well for at least a gallon ON THE BENCH, ADD a apc 10 X 10, bolt it on something that will scoot and enjoy near 20,000 rpm speeds. I race one against Jett 60 LX but againt low time pilots and yet to be beat!!! ENJOY