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R4
Model Documentation
- R4 Owners manual (German language) (published 1935) (11.4 MB)
- R4 Owners manual (German language) (published 1936) (23.4 MB)
- R4 Owners manual (German language) (published 1939) (11.1 MB)
- R4 parts manual (German language) (published 1932) (18.6 MB)
- R4 parts manual (German language) (published 1934) (22.1 MB)
- R4 parts manual (German language) (published 1935) (25.2 MB)
- R4 parts manual (German language) (published 1936) (21.8 MB)
- R4 parts manual (German language) (published 1942) (16.1 MB)
Model Specifications | |
|---|---|
| Drivetrain | |
| Displacement | 494cc |
| Cylinders | 2 |
| Bore x Stroke (mm) | 68 x 68 |
| HP @ RPM | 12 @ 3400 |
| Compression Ratio | 4.9:1 |
| Valves | Sidevalve, 2 per cylinder |
| Clutch | Dry, single plate, cable operated |
| Transmission | 3 speed, hand shifted |
| Final Drive | Driveshaft |
| Running Gear | |
| Frame | Tubular double loop, brazed |
| Front Suspension | Undamped, trailing link, leaf spring |
| Rear Suspension | Rigid |
| Front Brakes | 150mm drum, single leading shoe |
| Rear Brakes | Contracting shoe drum on driveshaft, heel operated |
| Electrical | |
| Ignition | Bosch magneto |
| Spark Plugs | Bosch W175 |
| Generator | Bosch magneto/generator |
| Capacities & Measurements | |
| Weight | 126kg |
| Fuel | 14l |
| Wheelbase | 1410mm |
| Top Speed | 95kph |
| Number Produced | 6502 |
Chassis serial numbers for the R4 had a preceding P as well.
The information provided here was obtained from a variety
of public sources and may not reflect official BMW archival data.
Please contact the BMW Archives for official data
regarding models.