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R 52

R 52
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Production
Begin of the Production 1928
End of the Production 1929
Numbers Produced 4377
Price 1.510,- RM
Engine
Internal Designation M 57
Motor Type four-stroke two-cylinder flat-twin
Bore x Stroke 63 x 78 mm
Displacement 486 ccm
Max Power 12 hp at 3400 rpm
Compression Ratio 5.0 : 1
Valves sv
Carburetion System 1 x carburettor, BMW Spezial two-valve 22 mm
Engine Lubricating System forced-feed lubrication
Oil Pump gear pump
Power transmission
Clutch single-plate, dry - from engine no. 50761:two plates
Number of Gears 3
Shifting manual
Gearbox Ratios 2.83 / 1.55 / 1.08
Rear Wheel Ratio 1 : 4.38 or 1 : 4.75 (with sidecar 1 : 5.7)
Bevel / Crownwheel 13 / 57 or 12 / 57 teeth (with sidecar 10 / 57)
Electrical system
Ignition System Bosch high-voltage magneto ignition
Generator Bosch magneto generator on request
Spark Plugs Bosch W 175
Chassis
Designation F 56
Frame twin-loop steel tubular frame
Front Wheel Suspension plate spring, 6 laminae
Rear Wheel Suspension rigid
Wheel Rims deep-bed 19 x 3
Tyres front 26 x 3.5 low pressure or 26 x 3.25 high pressure
Tyres rear 26 x 3.5 low pressure or 26 x 3.25 high pressure
Brakes front drum brake Ø 200 mm
Brakes rear external shoe brake at gearing (on cardan shaft)
Dimensions / Weights
Length x Width x Height 2100 x 800 x 950 mm
Wheel Base 1400 mm
Fuel Tank Capacity 12,5 l
Unladen Weight, Full Tank 152 kg
Load Rating 210 kg
Fuel Consumption approx. 3,5 l/100 km
Oil Consumption approx. 1 - 2 l/1000 km
Top Speed 100 kph
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