Upgrading speed performance for yamaha mio

SOURCE: need more speed for yamaha mio

Change the out put chain gear and final chain gear will give you more top end, but slower take off. Check out bike bandit for parts.

SOURCE: Upgrades

Pacific coast star has some cams and higher compression pistons that will bump your power significantly on pump gas. I respectfully disagree with Dickcanfixit, because there are a couple "full on" kits that can be had for this engine that'll make the harley Boys take a good look at your taillights.
have fun!