R51/2
Start of Production | 1950 |
Click to View Available Literature |
End of Production | 1951 | |
Numbers Produced | 5,000 | |
Price | 2,750 DM | |
Engine |
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Internal Designation | 254/3 | |
Motor Type | Four-stroke two cylinder flat twin | |
Bore x Stroke | 68 x 68 mm (2.67 x 2.67 in) | |
Displacement | 494 cc | |
Max Power | 24 hp at 5,800 rpm | |
Compression Ratio | 6.4 : 1 | |
Valves | OHV | |
Carburation System | 2 x carburettor type Bing 1/22/39 - 1/22/40 | |
Engine Lubricating System | Forced feed lubrication | |
Oil Pump | Gear pump | |
Power Transmission |
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Clutch | Single plate, dry | |
Number of Gears | 4 | |
Shifting | Foot shifting (+ auxiliary manual lever on the gear block) | |
Gearbox Ratios | 3.6 / 2.28 / 1.7 / 1.3 | |
Rear Wheel Ratio | 1 : 3.89 (1 : 4.57 with sidecar) | |
Bevel/Crownwheel | 9 / 35 teeth (7 / 32 with sidecar) | |
Electrical System |
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Ignition System | Battery ignition | |
Generator | Bosch 6 V/75 W | |
Spark Plugs | Bosch W 240 T1 | |
Chassis |
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Designation | 251/2 | |
Frame | Closed double steel tubular frame | |
Front wheel suspension | Telescopic fork | |
Rear wheel suspension | Telescopic suspension | |
Wheel rims | Deep bed rims | |
Tyres, Front | 3.5 x 19 | |
Tyres, Rear | 3.5 x 19 | |
Brakes, Front | Drum brake 200 mm / 7.87 in diameter half hub | |
Brakes, Rear | Drum brake 200 mm / 7.87 in diameter half hub | |
Dimensions / Weights |
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Length x Width x Height | 2130 x 815 x 720 mm (saddle) ( (83.85 x 32.08 x 28.34 in) | |
Fuel Tank Capacity | 14 litres / 3.07 gal / 3.69 gal US | |
Unladen Weight with Full Tank | 185 Kg / 407 lb | |
Clearance | 120 mm / 4.72 in | |
Load Rating | 400 Kg / 881 lb | |
Fuel Consumption | 4 litres 100 Km approx. / 70 mpg / 58 mpg US | |
Oil Consumption | 1 litre per 1,000 Km approx. | |
Top Speed | 135 Kph / 83 mph | |
Information kindly supplied by P.Hawksley