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R 51

R 51
. Data sheet
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Production
Begin of the Production 1938
End of the Production 1940
Numbers Produced 3775
Price 1.595,- RM
Engine
Internal Designation 254/1
Motor Type four-stroke two-cylinder flat-twin
Bore x Stroke 68 x 68 mm
Displacement 494 ccm
Max Power 24 hp at 5600 rpm
Compression Ratio 6.7 : 1
Valves ohv
Carburetion System 2 x carburettor type Amal 5/423
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), manual gear lever on request
Gearbox Ratios 3.6 / 2.28 / 1.7 / 1.3
Rear Wheel Ratio 1 : 3.89 (sidecar 1 : 4.62)
Bevel / Crownwheel 9 / 35 teeth (sidecar 8 / 37)
Electrical system
Ignition System battery ignition
Generator Bosch RD 50/6 2800 RS 15
Spark Plugs Bosch W 225 T1
Chassis
Designation 251/1
Frame twin-loop pressed steel 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 brakes Ø 200 mm
Brakes rear drum brakes Ø 200 mm
Dimensions / Weights
Length x Width x Height 2130 x 815 x 960 mm
Wheel Base 1400 mm
Fuel Tank Capacity 14 l
Unladen Weight, Full Tank 182 kg
Load Rating 210 kg (max. overall weight with sidecar 500 kg )
Fuel Consumption approx. 4 l/100 km
Oil Consumption approx. 1 l/1000 km
Top Speed 140 kph (with original sidecar 110 kph)
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