Define 'fully auto'. There are 'semi' auto motors out there that require the rider to initiate gear changes, but not deal with the clutch. There are a couple 2 speed fully autos out there, but I think they're 50cc and won't hold up to much modding.
RySem said:Gyro uses the little honda spree type engine. The little 49cc 2stroke deal. It's probably gonna take some ingenuity, but would be badass if done!