BMW R 47
Number sold 1.720
Price 1.850,- RM
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| Internal Designation | M 51 |
| Engine type | four-stroke two-cylinder flat-twin |
| Bore/stroke | 68 x 68 mm |
| Cubic capacity | 494 cm3 |
| Max power | 18 PS at 4000 rpm |
| Compression ratio | 5,8 : 1 |
| Valves per cylinder | ohv |
| Carburation system | 1 carburettor, Typ BMW Spezial two-valve 22 mm |
| 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 | 3 |
| Shifting | manual |
| Gear ratios | 2,5 / 1,5 / 1,07 |
| Rear wheel ratio | 1 : 4,38 (with sidecar 1 : 5,7) |
| Bevel/crown wheel | 13 / 57 teeth (with sidecar 10 / 57) |
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| Electrical system | |
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| Alternator | magneto generator on request |
| Ignition | Bosch magneto ignition |
| Spark plugs | Bosch W 175 |
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| Suspension | |
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| Designation | R 47 |
| Type of frame | twin-loop steel tubular frame |
| Front suspension | plate spring, 5 laminae |
| Rear suspension | rigid |
| wheel rims | CC 1 |
| Tyres front | 27 x 3,5 low pressure or 26 x 3 high pressure |
| Tyres rear | 27 x 3,5 low pressure or 26 x 3 high pressure |
| Brakes front | drum brake Ø 150 mm |
| Brakes rear | external shoe brake at the gearing (on cardan shaft) |
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| Dimensions and weights | |
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| Length x width x height | 2100 x 800 x 950 mm |
| Wheel base | 1410 mm |
| Tank capacity | 14 l |
| Unladen weight, full tank | 130 kg (with Original-sidecar 192 kg) |
| Load rating | k.A. |
| Top speed | 110 km/h |
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