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R 51 /3

R 51/3
. Data sheet
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Production
Begin of the Production 1951
End of the Production 1954
Numbers Produced 18420
Price 2.750,- DM
Engine
Internal Designation 252/1
Motor Type four-stroke two-cylinder flat-twin
Bore x Stroke 68 x 68 mm
Displacement 494 ccm
Max Power 24 hp at 5800 rpm
Compression Ratio 6.3 : 1
Valves ohv
Carburetion 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
Power transmission
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 (with sidecar 1 : 4.75)
Bevel / Crownwheel 9 / 35 teeth (with sidecar 7 / 32)
Electrical system
Ignition System magneto ignition
Generator Noris 6 V L 45/60 L
Spark Plugs Bosch W 240 T1
Chassis
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 deep-bed 3 x 19
Tyres front 3.5 x 19
Tyres rear 3.5 x 19
Brakes front drum brake Ø 200 mm (1952: duplex, 1954: full hub)
Brakes rear drum brake Ø 200 mm (1954: full hub)
Dimensions / Weights
Length x Width x Height 2130 x 790 x 985 mm
Wheel Base 1400 mm
Fuel Tank Capacity 17 l
Unladen Weight, Full Tank 190 kg (with original sidecar 320 kg)
Idle/Riding Noise 84/94 phon (from 7/7/1953: 81/85 phon)
Load Rating 355 kg (with original sidecar 600 kg )
Fuel Consumption approx. 4,5 l/100 km
Oil Consumption approx. 0,7 l/1000 km
Top Speed 135 kph (with original sidecar 95 kph)
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