BMW R51 (1938-40)

Make Model: BMW R 51


Year: 1938 – 40
Engine: Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Capacity: 494 cc / 30.1 cu in.
Bore x Stroke: 68 x 68 mm
Compression Ratio: 6.7:1
Cooling System: Air cooled
Induction: 2 x Amal 5/423 carburetors
Ignition: Battery ignition
Starting: Kick
Clutch: Single plate, dry
Max Power: 18 kW / 24 hp @ 5800 rpm
Transmission: 4 Speed
Final Drive: Shaft
Gear Ratio: 1st 3.60 / 2nd 2.28 / 3rd 1.70 / 4th 1.30:1
Frame: Closed double loop steel tubular frame
Front Suspension: Telescopic fork
Rear Suspension: Long swing arm with suspension units and oil pressure shock absorbers
Front Brakes: 200mm Drum, duplex full hub
Rear Brakes: 200mm Drum, simplex full hub
Front Tyre: 3.50 -19″
Rear Tyre: 3.50 -19″

Wet-Weight: 182 kg / 400 lbs
Fuel Capacity: 14 liters / 3.60 US gal


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