Engine: Bore Stroke :48.0 mm (1.890 in) x 46.8 mm (1.843 in) , Compression Ratio: 9.5/10.9 : 1, Engine: 84.7 cc (5.2 cu.in), 2-stroke, liquid-cooled , Fuel System :KEIHIN PE28, single , Ignition: Electronic ignition (CDI), Lubrication :Fuel/oil premixture of 30 : 1 , Starter: Primary kick ,