old topic but anythings possible if you have access to a welder but with a engine that small im sure you could make brackets to mount with any frame mods
i prefer honda and yamahas all the way. preferably the 80s 2 stroke era but i will take any yamaha or honda as long as it doesnt come out of thailand
also have afew china clones of the trx90 motor which actually function pretty well but cant say i would recommend them as i have acquired few for a reason... lol
just stay away from wiesco, i can vouch for the namura top end kits but the wiesco pistons are horrible in my opinion, they like to heat seize and expand alot faster then stock.