BMW R 4 series 3
Number sold 3.671
Price 1.150,- RM
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| Internal Designation | M 69 S 3 |
| Engine type | four-stroke vertical single cylinder engine |
| Bore/stroke | 84 x 78 mm |
| Cubic capacity | 398 cm3 |
| Max power | 14 PS at 4000 rpm |
| 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 |
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| Power transmission | |
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| 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) |
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| Electrical system | |
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| Alternator | Bosch, 45 W / 6 V |
| Ignition | battery ignition |
| Spark plugs | Bosch DM 175/1 |
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| Suspension | |
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| Designation | F 69 S 3 |
| Type of frame | pressed steel duplex frame |
| Front suspension | cantilever spring, 9 laminae with friction shock absorber |
| 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 |
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| Dimensions and weights | |
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| Length x width x height | 1980 x 850 x 950 mm |
| Wheel base | 1300 mm |
| Tank capacity | 12 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 |
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