Engine: 2-stroke, liquid-cooled Bore Stroke: 48.0 mm (1.890 in) x 46.8 mm (1.843 in) Compression Ratio: 9.5/10.9 : 1 Fuel System: KEIHIN PE28, single Lubrication: Fuel/oil premixture of 30 : 1 Ignition: Electronic ignition (CDI) Transmission: 6-speed constant mesh