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R 51
   
. Data sheet
. Back to Models
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)