BMW R51

BMW R 51

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