As long as the engine comes from a twin shock bike, it will fit evo
Sounds like there will be some cutting and shutting involved, would prefer not to cut up the frame....
What about fitting a XL350 engine?
Don't know a lot about four strokes, but I understand that there are plenty of aftermarket kits, cams etc for both the 500 and 350 and can be made to make good horsepower?