2011 APRILIA SR 50 R Factory, DIMENSIONS Length 73 in. (1,860 mm) Height 44 in. (1,120 mm) Width 27.8 in. (705 mm) Weight 198 lbs. (89.8 kg) Wheelbase 50.8 in. (1,290 mm) Seat Height 32.3 in. (820 mm) ENGINE and DRIVETRAIN Engine Horizontal, 1-cylinder, 2-stroke, electronic direct fuel injection Displacement 49 cc Bore x Stroke 1.6 x 1.5 in. (40 x 39.3 mm) Compression Ratio 11.5:1 Fuel System Fuel Injection: Electronically controlled, air assisted, direct injection into the combustion chamberInjector Type: EFI low flow injectorThrottle Body: 0.7 in. (18 mm) w/ integrated TPS (Throttle Position Sensor)Fuel Pump: 6.5 - 8 bar, high pressure pump w/ low electrical power absorption, less than 0.5A Fuel Capacity 1.8 gal. (7 l) Ignition High power inductive Starting System Electric Clutch Automatic centrifugal dry Cooling Liquid Lubrication Oil injection w/ oil pump Oil Capacity 0.3 gal. (1.2 l), 0.05 gal. (0.2 l) reserve Transmission Continuous automatic variator Final Drive Gears in oil bath