They used these kits I believe to race in the 200 class with an ATC250r,and from what I've heard, were pretty friggin fast! K10Seibel has a restored 200r in a thread here I believe. And Carlos(BDT) knows quite a bit about the Selvy's stuff. There is more info on the 3 wheeler sites(.org and world.net). Def rare piece of history, and have seen VERY few for sale. I have a selvy's trx top end, sectional pipe and silencer,that I really would like to keep but probably gonna sell to fund the dune build.thats pretty neat, why a 200cc tho ? is it fast ?