BMW R11 Series 3 (1931)

Technical Specifications
1931 BMW R11 Series 3
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
78.0 x 78.0 mm (3.07 x 3.07 inches)
745 cc
Side Valve
5.5:1
18 HP @ 3400 rpm

Single carburettor Type SUM CK 3/500 F 1
3-speed
Shaft
Two plate dry clutch
Magneto ignition
Kick starter
Forced Feed Lubrication

Bosch W 175 T1
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 pressed steel frame

2100 mm (78.70 inches)
890 mm (35.03 inches)
950 mm (37.40 inches)
1380 mm (54.33 inches)
828 mm (32.6 inches)
185 mm (7.3 inches)
162 kg
14 litres
Black
Plate spring 9 laminae
Rigid
26 x 3.5 low pressure or 26 x 3.25 high pressure
26 x 3.5 low pressure or 26 x 3.25 high pressure
Drum brake 200 mm / 7.87 inches diameter
Cardan brake, 55 mm / 2.16 in width

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