i most proud of this build i started with a raw Gary fisher steel frame , i laced a three speed shimano on the rear wheel and a disc break for a front hub . with steel rims , and i added the front forks with shocks and a spring loaded seat post . i built this motor from the case . adding a bullet style high compression head , and a hp walbro knock off carb , straight pipe with expansion chamber and silencer , i really didn't know what to expect . i was afraid to start it . but it runs great . in fact an unexpected result of three speed internal . first gear o to 37mph and i still need to dial in the carb . if you know how to do this . please help .