Do any of you have/had one? Recommendations? Was thinking maybe electric but they are way more expensive and the same thing I have ran into with cordless tools, the battery will go bad and possibly you can't get a replacement in the future. Gas engine kits are fairly cheap and if it goes bad you can get another one, maybe a different brand but they are pretty much all the same by the looks of them. I have an old mountain bike that I would spend more on fixing the bike itself than the engine kit. Would be fun to have though, I think.