Has anyone ever looked into replacing the FT engine with a XR650 or CRF450 engine. I have a very good engine with a new Wiseco 10:1 piston, top-end cleaned up, new valve seals, etc. It runs very good, but my starter drive seems to get weaker every time I go to start it. And the prices for used starter drive parts or unreal. I'm buying a CRF 450 from the local Honda dealer as soon as his deal is final. Thinking of pulling both engines to see how much would be involved. I would rather go with a recent 2000-up 650L engine as opposed to the water cooled 450, but looks like I'm definitely getting the 450 first. Has any one ever tried the 650 in the FT?