Description: -This Engine Has A Three Disc Crank Mounted Heavy Duty Manual Clutch. The Head Has A Large Domed Combustion Chamber With Large Valves. The Intake Valve Is 27mm Exhaust Valve Is 23mm. This Engine Must Be A Neutral To Start With A Kick Starter. Type: 4-Stroke Single-Cylinder Ohc Air Cooled -Bore & Stroke: 54 X 54mm -Compression Ratio: 9.47:1 -Displacement: 123.7cc -Max.