That's excellent. The Banshee quad motor is essentially the same as a 350YPVS, and there's a big aftermarket industry for tuning parts (barrels, heads, pistons, lock-up clutches etc).
Some UK YPVS owners have used aftermarket Banshee top-ends (you can get up to 450cc if I remember correctly) to give 75+ bhp at the back wheel
