BMW R 4 
| Make Model | BMW R 4 | | Year | 1932-37 | | Engine | Air cooled, four stroke, single cylinder vertical | | Capacity | 498 | | Bore x Stroke | 84 x 78 mm | | Compression Ratio | 5.7:1 | | Induction | 1 x carburetor type SUM CK 3/500 Fr | | Ignition / Starting | Battery ignition / Kick | | Generator | Bosch 6V/45W | | Clutch | Single plate, dry | | Max Power | 14hp @ 4000 rpm | | Transmission / Drive | 4 Speed / shaft | | Gear Ratio | 1st 3.6 2nd 2.28 3rd 1.7 4th 1.3 | | Frame | Pressed steel duplex frame | | Front Suspension | Plate spring, 9 laminae with 2 friction shock absorbers | | Rear Suspension | Rigid | | Front Brake | 160mm drum | | Rear Brakes | 160mm drum | | Front Tyre | 26 x 3.5 SS | | Rear Tyre | 26 x 3.5 SS | | Wet-Weight | 137 Kg | | Fuel Capacity | 12 Litres | |
