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Installation process: 1. Fix the chain wheel assembly on the bicycle rear wheel: All parts are fit on the side without original bicycle chain. Please keep original bicycle chain without any changes. Fit over the clamping rubber no cutting one on the rear axis outside of Stcelwheel spoke first then fit over the chain wheel keep chain wheel concave side close to outside clamping rubber. Fit over the other outside clamping rubber with cutting one on the rear axis inside of steel wheel spoke. Keep the two rubbers clamping tightly on each side of steel wheel spoke. Then keep the big and small clamping board close to the clamping rubber inside of steel wheel spoke screw and make the chain wheel assembly tightly on rear wheel. Please pay attention to keep pulsating up to 1mm between radial and axis of the chain wheel and rear axis. 2. Fix the motor on the bicycle frame. Inosculate the crankcase circular are with bicycle frame then fix it. The center line of cylinder is normally incline forward about 20. 3. Fix the chain and adjust the degree of tightness use idler pulley. 4. Fix the protecting casing. 5. Fix the vent-pipe. 6. Fix the accelerograph control set on the right hand of bicycle. Fix the clutch control set on the lfet hand of bicycle. 7. Fix the oil tank at the crossbeam of bicycle and connect the oil tube to carburetion oil inlet.