BMW R 4 series 2
Number sold 1.737
Price 1.150,- RM
| Engine | |
|
| |
| internal designation | M 69 S 2 |
| engine type | four-stroke two-cylinder flat-twin |
| Bore/stroke | 84 x 78 mm |
| Cubic capacity | 398 cm3 |
| Max power | 12 PS at 4000 U /min |
| Compression ratio | 5,7 : 1 |
| Valves per cylinder | ohv |
| Carburation system | 1 carburettor Typ SUM CK 3/500 Fr |
| Engine lubrication | forced-feed lubrication |
| oil pump | gear pump |
|
| |
| Power transmission | |
|
| |
| Clutch | single discs, dry |
| Number of gears | 4 |
| shifting | manual (framekulisse) |
| Gear ratios | 3,6 / 2,18 / 1,35 / 1,1 |
| Rear wheel ratio | 1 : 5,11 (with sidecar 1: 5,63) |
| Bevel/crown wheel | 9 / 46 teeth (with sidecar (8 / 45) |
|
| |
| Electrical system | |
|
| |
| Alternator | Bosch, 30 W / 6 V |
| Ignition | battery ignition |
| Spark plugs | Bosch DM 175/1 |
|
| |
| Suspension | |
|
| |
| designation | F 69 S 2 |
| Type of frame | pressed steel duplex frame |
| Front suspension | cantilever spring, 9 laminae mit Reibungsstossdämpfer |
| Rear suspension | rigid |
| wheel rims | 26 x 3,5 |
| Tyres front | 26 x 3,5 SS |
| Tyres rear | 26 x 3,5 SS |
| Brakes front | drum brake Ø 180 mm |
| Brakes rear | drum brake Ø 180 mm |
|
| |
| Dimensions and weights | |
|
| |
| Length x width x height | 1980 x 850 x 950 mm |
| Wheel base | 1300 mm |
| Tank capacity | 10 l |
| Unladen weight, full tank | 137 kg |
| permitted loading | 200 kg |
| Fuel consumption | ca. 3,5 l / 100 km |
| oil consumption | ca. 1 - 2 l / 1000 km |
| Top speed | 100 km/h |
|
| |
