the stock setup, the one you have now, if you have a volcano has a single speed with a 17 tooth clutch bell, there is and upgraded transmission/clutch bell that you can buy for it, it will give you better low end and better top end, here it the link:
http://www.clermontmotorsports.com/s...iff-kit/Detail
if you want to leave your stock transmission just replace the aluminum clutch bell with this:
http://www.clermontmotorsports.com/s...-vented/Detail this will not do anything to improve proformance, it will just help the spur gear not to strip since the aluminum bells are soft and warp easily.