So the forced greeting is kind of weird. I usually prefer to lurk and learn but whatever. I need to build a 49cc bike (preferably 4-stroke) to help with a work/school commute. I'm trying to figure out which engines are the most reliable and what kind of parts are readily available. I'm entertaining buying 2 engines off the bat in case one breaks on me. My current resources are only a few sites: gasbike dot net station inc bicycle-engines sick bike parts helio bikes spooky tooth gru bee The only other decent looking forum was motor bicycling. Moped army doesn't really deal with this kind of this either. Oh well, hope to get the info I need so I can buy the right parts and repair things as needed.