Production Model Years
1935 - 1941
Frame and Engine Numbers
501 - 24149
25001 - 37161
501 - 24728
25001 - 37161
Model Specifications
Displacement 745cc
Cylinders 2
Bore x Stroke (mm) 78 x 78
HP @ RPM 18 @ 3400 (single Sum carburetor)
20 @ 3400 (twin Amal carburetors)
Compression Ratio 5.0:1 (early), 5.5:1 (middle), 5.7:1 (late)
Valves Sidevalve, 2 per cylinder
Clutch Dry, dual plate, cable operated
Transmission 4 speed, hand shifted
Final Drive Driveshaft
Running Gear
Frame Pressed steel, rivetted
Front Suspension Hydraulically damped telescopic fork
Rear Suspension Rigid
Front Brakes 200mm drum, single leading shoe
Rear Brakes 200mm drum, single leading shoe, heel operated
Ignition Bosch magneto (Battery/coil default on civilian models, magneto optional; magneto on all military models)
Spark Plugs Bosch W175
Generator Bosch B245 RS108 generator, 6V 45/70W, standard on civilian models, D2B R 6V 30/50W magneto/generator optional on civilian and standard on military models
Capacities & Measurements
Weight 185kg
Fuel 14l
Wheelbase 1380mm
Top Speed 110kph
Number Produced 36390

First production hydraulically damped telescopic forks. Second range of frame and engine numbers matched when they left the factory. First BMW with front and rear wheels exchangeable.


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