highly recommend buying from these guys
2 Stoke Bike Engine Kits
bought from them to replace my grubee motor. gotta say, their motor was in much better quality than the grubee one was.
the main thing that sold me on it was "My wrist pins are rated for 27,000 rpm’s most other engines are only rated for 6000 rpm’s (if your lucky)." http://www.daemonbikes.com/pages/Why...better%3F.html
granted your not going to be going up to 27,000rpm. but it's reassuring to know that if something does happen that wrist pin won't shatter.
also free shipping is nice too :3