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BMW Motorcycles

New Model Info

Pre-Owned

Community

Production

Begin of the Production		1927

End of the Production		1928

Numbers Produced		1720

Price		1.850,- RM


Engine

Internal Designation		M 51

Motor Type		four-stroke two-cylinder flat-twin

Bore x Stroke		68 x 68 mm

Displacement		494 ccm

Max Power		18 hp at 4000 rpm

Compression Ratio		5.8 : 1

Valves		ohv

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

Number of Gears		3

Shifting		manual

Gearbox Ratios		2.5 / 1.50 / 1.07

Rear Wheel Ratio		1 : 4.38 (with sidecar 1 : 5.7)

Bevel / Crownwheel		13 / 57 teeth (with sidecar 10 / 57)


Electrical system

Ignition System		Bosch magneto ignition

Generator		magneto generator on request

Spark Plugs		Bosch W 175

Chassis

Designation		R 47

Frame		twin-loop steel tubular frame

Front Wheel Suspension		plate spring, 5 laminae

Rear Wheel Suspension		rigid

Wheel Rims		CC 1

Tyres front		27 x 3.5 low pressure or 26 x 3 high pressure

Tyres rear		27 x 3.5 low pressure or 26 x 3 high pressure

Brakes front		drum brake Ø 150 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		1410 mm

Fuel Tank Capacity		14 l

Unladen Weight, Full Tank		130 kg (with original sidecar 192 kg)

Top Speed		110 kph