BMW R39 (1925)

Technical Specifications
1925 BMW R39
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, single cylinder vertical
68.0 x 68.0 mm (2.67 x 2.67 inches)
247 cc
OHV
6.0:1
6.5 hp @ 4000 rpm

1 carburettor Type BMW Spezial 20 mm
3-speed
Cardan
Single plate dry clutch
Bosch magneto generator type G 1.8V/15W
Kick starter
Lubrication by gear pump in sump

Bosch W 175
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)

Twin loop tubular frame

2050 mm (80.70 inches)
800 mm (31.49 inches)
950 mm (37.40 inches)
1380 mm (54.33 inches)
785 mm
185 mm (7.3 inches)
110 kg
10 litres

Plate spring, 4 laminae
Rigid
27 x 3.5 balloon or with 26 x 3 high pressure tyres
27 x 3.5 balloon or with 26 x 3 high pressure tyres
Internal shoe drum brake 150 mm / 5.90 in diameter
External shoe brake at the gearing on Cardan shaft

Image: http://www.bmbikes.co.uk
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