BMW R42 (1926)

Technical Specifications
1926 BMW R42
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, two cylinder flat twin
68.0 x 68.0 mm (2.67 x 2.67 inches)
494 cc
SV
4.9:1
12 hp @ 3400 rpm

1 carburettor, Type BMW Spezial 2 valve 22 mm
3-speed
Cardan
Single plate dry clutch
Bosch magneto ignition
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

2100 mm (82.67 inches)
800 mm (31.49 inches)
950 mm (37.40 inches)
1410 mm (55.51 inches)
785 mm
185 mm (7.3 inches)
126 kg
14 litres

Plate spring, 5 laminae
Rigid
26 x 3.5 on 19 x 3 or 27 x 2.75 on 21 x 2.5
26 x 3.5 on 19 x 3 or 27 x 2.75 on 21 x 2.5
Drum brake 150 mm / 5.90 in  diameter
External shoe brake at the gearing on Cardan shaft

Image: http://my-blackberry.net
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