BMW R51 (1938)

Technical Specifications
1938 BMW R51
Engine
Engine type
Bore x Stroke
Displacement
Valves
Compression ratio
Max Power
Max Torque
Fuel system
Transmission
Final drive
Clutch
Ignition type
Starting system
Lubrication
Exhaust
Spark plug
Battery
Gear ratios

Air-cooled, 4-stroke, Four-stroke two cylinder flat twin
68.0 x 68.0 mm (2.67 x 2.87 inches)
494 cc
OHV
6.7:1
24 hp @ 5600 rpm

2 x carburettor type Amal 5/423
4-speed (foot shifting)
Cardan
Single plate saucer spring, dry
Magneto ignition
Kick starter
Forced feed lubrication

Bosch W 225 T1
6 volt 12 amp hour
Dimensions
Frame type
Castor
Overall length
Overall width
Overall height
Wheelbase
Seat height
Ground clearance
Dry weight
Fuel capacity
Colors
Suspension (front)
Suspension (rear)
Tyre (front)
Tyre (rear)
Brake (front)
Brake (rear)

Closed double steel tubular frame

2130 mm (83.85 inches)
960 mm (32.08 inches)
960 mm (37.79 inches)
1400mm (55.11 inches)
850 mm (33.50 inches)
165 mm (6.49 inches)
182 kg
14 litres

Telescopic fork
Telescopic suspension
3.25 R19
4.00 R18
Drum brake 200 mm / 7.87 in diameter duplex full hub
Drum brake 200 mm / 7.87 in diameter simplex full hub

Image: http://www.bmbikes.co.uk
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