my advise to you is to do some home work and decide how fast you want to go and what type of riding you want to do ! there are several veterain shee guys on hear and they are aesy to find!
i completly rebuilt my motor top and bottom! trans gears, bearings, pistons, rings, bore, cool head, 20 cc domes, and on and on and after taking it on 1 trip to the dunes i decided it wasent fast enough for me! so im tearing a completly rebuilt motor with 4 hrs on it down and throwing a couple more grand at it. i wish i did this the first time i could have save 700-1000$