BMW R 61
Number sold 3.747
Price 1.420,- RM
| Engine | |
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| internal designation | 261 / 1 |
| engine type | four-stroke two-cylinder flat-twin |
| Bore/stroke | 70 x 78 mm |
| Cubic capacity | 600 cm3 |
| Max power | 18 PS at 4800 U /min |
| Compression ratio | 5,7 : 1 |
| Valves per cylinder | sv |
| Carburation system | 2 carburettor Typ Amal M 75/426 S |
| 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 | foot shifting (+ auxiliary manual lever on the gear block) |
| Gear ratios | 3,6 / 2,28 / 1,7 / 1,3 |
| Rear wheel ratio | 1 : 3,89 (sidecar 1 : 4,62 |
| Bevel/crown wheel | 9 / 35 teeth (sidecar 8 / 37) |
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| Electrical system | |
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| Alternator | Bosch RD 50/6 2800 RS 17 |
| Ignition | battery ignition |
| Spark plugs | Bosch W 175 T 1 |
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| Suspension | |
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| designation | 251 / 1 |
| Type of frame | twin-loop steel tubular frame |
| Front suspension | telescopic fork |
| Rear suspension | telescopic fork |
| wheel rims | deep-bed 3 x 19 |
| Tyres front | 3,50 x 19 |
| Tyres rear | 3,50 x 19 |
| Brakes front | drum brake, Ø 200 mm |
| Brakes rear | drum brake, Ø 200 mm |
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| Dimensions and weights | |
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| Length x width x height | 2130 x 815 x 960 mm |
| Wheel base | 1400 mm |
| Tank capacity | 14 l |
| Unladen weight, full tank | 184 kg |
| load rating | 210 kg ((max. overall weight with sidecar 500 kg) |
| Fuel consumption | ca. 3,5 l / 100 km |
| oil consumption | ca. 1 l / 1000 km |
| Top speed | 115 km/h (with sidecar 100 km/h) |
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