Re: what did you do to your motorized bicycle today?
Are you running a totally stock outta the box kit ? if so you may to do some upgrades, base gaskets are CHEAP! you can even make one or all yer self, Porting is a BIG PLUS! outta the box, get a better ignition system one with a coil, an expansion chamber and try a better fuel additive like Opti-2 Carbs help as well like a Dax RT carb (decent price) heads make a BIG difference.
So many things that you can Change out, Modify, and clean up to give you the riding experience you want and you'd get real familiar with yer engine in the process, they aren't that hard to work on.