they are called happy time motors. Basically a chitty chinese pot metal 70cc 2-stroke motor. The kit comes with all the crap to bolt on to a 26" bike. They normally do about 20-25mph, but with a sprocket change or multi speed cassett they can get up to 70ish. I have had one for a few years, but it only ran for a short bit due to cook and robbie getting their hands on it. My new motor is fully ported and polished, decked head, with upgraded ignition and carb, so it should make between 5-7hp, doesnt seem like much until you see how chitty these things are made.
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Originally Posted by RCcola55
no replacement for displacement. 