Used vw 1600 dual port engine and 4 speed transmission.I hand built the frame around the motor and trans.I bought a sprocket from tractor supply machined it to fit stub axel.Iswitched the ringgear sides to make it run backwards.I welded the spider gears up to lock the axels together.I used suzuki rear wheel,goldwing front wheel.Its lots of fun to ride people stop to look at it.