Re: Cycle Force Group??
Just found this older post by searching for "cycle force". I'm in Afghanistan right now, and the only bike I was able to get from the PX was a Smith and Wesson "Tactician" (actually manufactured by Cycle Force Group). Which was inexpensive ($99) and is painted in a cool foliage green color - but sadly, it also has a fairly small front triangle (see the attached picture that I stole from the internet).
I also got a Zoombicycles engine kit from Pirate Cycles (when Justin found out I was in Afghanistan he sent me $140 of engine kit and accessories for free - I'll write more about how cool that guy is very soon!!!) And after it arrived, I discovered that the top tube of the bike frame is just about 1" too low for this engine (even with its slant-head top). Rats! Not one to get discouraged however, I'm trying to come up with a work-around in my spare time.
Anyway the bottom line is that this frame from Cycle Force Group is too small to easily accomodate a typical chinese 2-stroke engine.