hi to everyone.... I have a "big mo" chopper style bike and found a motor supplier here in new zealand so have ordered a motrax two stroke kit for it. The motor looks very similar to the common ones that i have been seeing here referred to as a ?china girl? but with the importers sticker on the side. I have been spending allot of time reading posts here to try and get a bit familiarized with motorizing a bicycle and have found this site to be a wealth of info. A big thanks to all the contributors. I was wondering if anyone could tell me what sort of rpm range these engines peek out at normally. I have seen peek power quoted at 6000rpm but what sort of rpm do they tend to get to before flying apart?