Apr 03, 2009 The Honda 50cc Road Racers regularly went over 100mph. So did the old Suzuki and Yamaha 50cc road racers. They used to run some really wicked 50cc, 3 cylinder, rotary valve, 2 cycle engine powered motorcycles in the road races too. HuaSheng 49cc Engine Only (4STROKE) Fits HuaShang 49cc Cent. Clutch Engine only. Transmission, Gas Tank, 415 Chain, Engine Mount, Throttle& Cable, Idler, 3pcs. wide pedal crank fits big or small bottom hole, Clamp to spokes sprocket kit, 12T HD Freewheel drive sprocket, 100T solid driven pulley, and 48T wheel sprocket.