BMW R 42
Number sold 6.502
Price 1.510,- RM
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| Internal Designation | M 43 |
| Engine type | four-stroke two-cylinder flat-twin |
| bore x stroke | 68 x 68 mm |
| displacement | 494 cm3 |
| output | 12 PS at 3400 rpm |
| compression ratio | 4,9 : 1 |
| valves | sv |
| carburetion system | 1 carburettor BMW Spezial two-valve 22 mm |
| engine lubricating | forced-feed lubrication |
| Oil pump | gear pump |
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| Power transmission | |
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| Clutch | single discs, dry |
| no. of gears | 3 |
| Shifting | manual |
| Gear ratios | 2,49 / 1,50 / 1,08 |
| rear wheel ratio | 1 : 4,53 or 1 : 3,8 (sidecar 1 : 6, 27 or 1 : 5,7) |
| bevel/crown wheel | 15 / 68 or 15 / 57 teeth (sidecar 11/ 69 or 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 42 |
| frame | twin-loop steel tubular frame |
| front wheel suspension | plate spring, 5 laminae |
| rear wheel suspension | rigid |
| wheel rims | deep-bed 19 x 3 or 21 x 2,5 |
| tyres, front | 26 x 3,5 on 19 x 3 or 27 x 2,75 on 21 x 2,5 |
| tyres, rear | 26 x 3,5 on 19 x 3 or 27 x 2,75 on 21 x 2,5 |
| brakes, front | drum brake Ø 150 mm |
| Brakes rear | external shoe brake at 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 | 126 kg (with Original sidecar 188 kg) |
| Load rating | k.A. |
| Fuel consumption | ca. 3 l / 100 km |
| Oil consumption | ca. 1,7 l / 1000 km |
| Top speed | 95 km/h |
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