Mitsubishi TLE43 42.7 cc 2.20 hp Very Quiet two cycle engine and complete gear & chain Drive kit. This is a complete gear & chain drive kit. As with all the engines brands & sizes this can be put on other product - types - styles of bikes. The kit shown is the OUTSIDE Drive, our standard kit. A outside drive has the sprocket - chain guard on the left side of the gear box. The gear box mounts directly above the tire and the four support line up real nice to support the gear box - engine. You can also order it as a INSIDE DRIVE, where the gear box in more to the left side of the tire and the output shaft comes out in between the gear box and the engine. The inside drive gear box will be harder to install but many customers like the way they look.