I have it in my fevered brain to use a motorcycle engine in a homebrew aircraft. I will only need 70-85hp, so both the F800 and SV650 engines seem like good candidates to me. The 650 'Strom may also be an option, and might be cheaper to get. Anybody pull these powerplants for an approximate weight? I am not really finding any data on raw power-weight for just the motor. More appropriate motor suggestions are welcome, but weight should be minimal. Reliability is obviously a consideration, and most modern engines seem to fit that requirement nicely.