... Cylinder, Air Cooled (125cc) 4-Stroke, Single Cylinder, Oil Cooled (140cc) 4-Stroke, Single Cylinder, Oil Cooled (150cc) 4-Stroke, Single Cylinder, Oil ... Cooled (160cc)2) Bore & Stroke: 52.4 x 55.5mm (125cc) 55 x 59mm (140cc) 60 x ... Ratio: 9.0:1 Drive Chain1) Transmission: 4-Speed, lnternational Shifter2) Clutch: Manual3) Final Drive:#428 4) Max Power: 6.5kw/7500rpm(1 ...