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BMW R 4

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Make Model

BMW R 4

Year

1932 - 37

Engine

Four stroke, single cylinder vertical

Capacity

498 cc / 30.4 cu in.
Bore x Stroke 84 x 78 mm
Compression Ratio

5.7:1

Cooling System

Air cooled

Induction

1 x carburetor type SUM CK 3/500 Fr

Ignition

Battery ignition

Starting

Kick

Generator

Bosch 6V/45W

Clutch Single plate, dry

Max Power

10.4 kW / 14hp @ 4000 rpm

Transmission

4 Speed

Final Drive

Shaft
Gear Ratio 1st 3.6 / 2nd 2.28 / 3rd 1.70 / 4th 1.30:1
Frame Pressed steel duplex frame

Front Suspension

Plate spring, 9 laminae with 2 friction shock absorbers

Rear Suspension Rigid, sping loaded saddle
Front Brake 160mm Drum

Rear Brakes

160mm Drum

Front Tyre

3.50 x 26" SS

Rear Tyre

3.50 x 26" SS

Wet-Weight

137 kg / 302 lbs

Fuel Capacity 

12 L / 3.2 US gal
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