My bike has an ungoverned 212 harbor freight engine on it with a 12 tooth clutch and a 60 tooth rear sprocket. The displacement is quite a bit large for a bike so small that the gas tank wont fit on the engine. The power it produces does not get used to its full potential as I am almost always keeping it at a somewhat maintained speed and I am not too aggressive with the throttle. If I wanted to get some more speed without having to rev the engine higher than I would like it to, then could it be as simple as changing the sprocket sizes? I'm assuming so but I usually don't know the strings attached that come along with doing so. Would the more common thing to do be changing the 12 tooth clutch to a 15, or would it be taking the 60 tooth rear down to a 48 or even less? I'm sure I'd lose some acceleration speed but i am more concerned with having a higher overall speed so that I can ride it faster without something in the engine going wild.