This is a complete low, mile, easy-use engine. Comes with everything to make a turn-key bike. Engine, tpi system including a computer, wiring, oil tank, and odometer(oem trail tech odo) This was an around-the-cabin bike with around 500 miles of forest service roads and giving the kids rides. The cycle is now a 500cc with a non tpi donor motor, so if there is anything else you need associated with the motor, just ask