Crazy, My advise to you is, put that engine back in the bike and restore it!!!! I have done what you want to do about 5 years ago with a Honda CB650 engine. Also, I WILL NOT help you, so don't ask. I too thought it was a cool idea until I ended up with a broken arm, collar bone, dislocated knee, and more hospital bills than I care to think about. Take my advise, and learn from my STUPIDITY, and build a sanctioned racing mower!!