... stroke,cooled by wind Diameter of the cylinder(mm):52.4 Journey of the piston(mm):57.8 125cc ... motor engine Configuration dataEngine type:single cylinder, 4 stroke,cooled by windDiameter of ... the cylinder(mm):52.4Journey of the piston(mm):57.8Total ... exhaust:124.6angle of ignition advance: 13°±2°/1700r/min ...