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BMW Motorcycles

New Model Info

Pre-Owned

Community

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)