There should be a cogged belt drive coming onto the market soon, from a machinist friend of mine. I tried to talk him out of it, because of the expense involved, and lets face it, most of us motorbikers are cheapskates. The reason they use a chain drive from the factory is because it is cheap and easy to fit; the downside is noise and high maintenence. The cogged design eliminates slippage, and provides more leeway in adjustment. Also, his belt tensioner will eliminate the dreadfully cheap and dangerous stock chain tensioner. Whether enough people will step up and purchase one remains to be seen.