Originally Posted by LukasM
It's actually the bottom mounts that you need to move/reweld, and you also have to modify the front mounts, either by milling down the cases on each side or by bending the mounts out, IIRC it's 1mm per side.
But you probably knew this seeing how you built one.
Haha, yeah but I built a 540. Dirttricks did the fab. I think the short stroke is the way to go to fully take advantage of the improved handling, but that is just a theory since I never tried it. I really wanted a 450sx with and exc tranny and flywheel. I think that would have been a great bike, at least where I live/ride.