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This is full complete air cooling RS100 motor. It supplied with: big bore cylinder kit with forged high compression piston size 76mm, 4 valves cylinder head valves size EX26/IN28.5, crankshaft longer stroke 12000 microns, special transmission, CNC aluminium transmission cover and lids, high perfomance ignition, powerful starter.. The price includes fully configured engine as shown on photos below. Just plug and play!