BMW R 51 494 (1938 - 1940) Description & History: The R51 was manufactured from 1938 to 1940. There were some versions of this motorcycle, the R52/2, produced between 1950-1951, and the R51/3, built from 1951 to 1954. They had a four-stroke two cylinder flat twin engine with a displacement of 494cc and a power of 24 horses.
BMW R 51 494 1938 - 1940 Full Specifications:Brand: BMW, Model: R, Type: R 51 1938, Name Year: R 51 494 1938 - 1940, Engine Type: Four-stroke two-cylinder flat-twin, Displacement: 494 cm3, Bore Xstroke: 2.67x2.67 in OR 67.8x67.8 mm, Compression: 6.7:1, Horsepower: 18(24)/5600 KW(hp)/RPM, Torque: -, Fuel System: Carburetors, Gearbox: 4-speed, Clutch: Single plate, dry, Primary Drive: -, Final Drive: -, Frame: Twin-loop steel tubular frame, Front Suspension: Telescopic fork, Rear Suspension: Telescopic fork, Front Brake: Drum brake 200 mm, Rear Brake: Drum brake 200 mm, Length: 83.85 in OR 2130 mm, Width: 32 in OR 813 mm, Seat Height: -, Wellbase: 55 in OR 1397 mm, Ground Clearance: -, Weight: 401 lbs OR 182 kg, Fuel Capacity: 3.69 gallons OR 3.69 L, Tyres Front: 3.5x19, Tyres Rear: 3.5x19.