There are some good 4 stroke kits out there now. I'm referring to the frame mount types, which all use the Hua Sheng chinese engine. If this engine doesn't measure up, the smaller Honda GX engine can be used. If only the dealers were more reputable and made sure the consumer got all the parts they need, it would be great, but that seems to be the biggest problem now. I hardly even considered the 2 stroke. I'm not after the "cool" look. I need reliable transportation and don't want to stand out. I know that's not the case with a lot of people. I didn't know about this kit (link below), but as far as low key profile and a chain drive instead of a roller drive, this kit looks pretty good. It has the very low profile looks of a friction drive but is a chain drive. I just don't know about that "Bridgestone" engine that's on it. Sounds like a case of the Chinese ripping off a well known established name and using it as their own. Installation looks very easy.
Motorized bicycles or bike motors, electric bikes or bicycle engine kits