Start of Production | 1951 |
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| End of Production | 1954 |
| Numbers Produced | 18,420 |
| Price | 2,750 DM |
| Engine |
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| Internal Designation | 252/1 |
| 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 | 6.3 : 1 |
| Valves | OHV |
| Carburation System | 2 x carburettor type Bing 1/22/41 - 1/22/42 or 1/22/61 - 1/22/62 |
| Engine Lubricating System | Forced feed lubrication |
| Oil Pump | Gear pump |
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| 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 | 4.0 / 2.28 / 1.7 / 1.3 ('till the end of 1951: 3.6 / 2.28 / 1.7 / 1.3) |
| Rear Wheel Ratio | 1 : 3.89 (1 : 4.75 with sidecar) |
| Bevel/Crownwheel | 9 / 35 teeth (7 / 32 with sidecar) |
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| Electrical System |
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| Ignition System | Magneto ignition |
| Generator | Noris 6 V L 45/60 L |
| Spark Plugs | Bosch W 240 T1 |
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| Chassis |
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| Designation | 251/3 (1951), 251/4 (1952/53), 251/4 (1954) |
| Frame | Double loop steel tubular frame |
| Front wheel suspension | Telescopic fork |
| Rear wheel suspension | Telescopic suspension |
| Wheel rims | 3 x 19 deep bed |
| Tyres, Front | 3.5 x 19 |
| Tyres, Rear | 3.5 x 19 |
| Brakes, Front | Drum brake 200 mm / 7.87 in diameter (1952:duplex, 1954: full hub) |
| Brakes, Rear | Drum brake 200 mm / 7.87 in diameter (1954: full hub) |
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| Dimensions/Weights |
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| Length x Width x Height | 2130 x 790 x 985 mm (83.85 x 31.10 x 38.77 in) |
| Wheel Base | 1400 mm / 55.11 in |
| Fuel Tank Capacity | 17 litres / 3.73 gal / 4.49 gal US |
| Unladen Weight with Full Tank | 190 Kg / 418 lb (with original sidecar, 320Kg / 704 lb) |
| Idle/Riding Noise | 84 / 94 phon (from 7/7/1953: 81 / 85 phon) |
| Load Rating | 355 Kg / 781 lb (with original sidecar, 600 Kg / 1321 lb) |
| Fuel Consumption | 4.5 litres 100Km approx. / 62 mpg / 52 mpg US |
| Oil Consumption | 0.7 litre per 1,000 Km approx. |
| Top Speed | 135 Kph / 83 mph (95 Kph / 59 mph with original sidecar) |
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