I've been thinking about replacing the OE Chinese CN250 clone engine in my little chinese-built "Go-Kart" (dune buggy) With an FSC600. With the CN250 having been designed with a V-belt transmission for the Honda Helix scooter and the FSC600 (FJS600, etc) having been designed with a V-belt transmission for the Honda Silverwing scooter, it would seem superficially like a pretty easy upgrade repower. Despite them having done innumerable engine swaps, I haven't been able to find anybody in the mini-buggy community who has any insight regarding similarities and dissimilarities between these engines. My hope is that you folks or someone you have rubbed up against in the scooter or F1 superkart communities know about the challenges expected in such a swap.

This probably won't directly address your question, but here is a link to a very in-depth engineering paper on reworking a FSC600 engine to power a snow mobile.

The article was sleuth'd out a few years ago by our very own Dan Spevack.

http://www.mtukrc.org/download/buffalo/suny_buffalo_design_paper_2005.pdf

That article could also be called "How to add a Turbocharger to your Silver Wing (plus some other stuff about Snowmobiles)"

>:D