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BMW Motorcycles

New Model Info

Pre-Owned

Community

Production

Begin of the Production		1925

End of the Production		1927

Numbers Produced		855

Price		1.870,- RM


Engine

Internal Designation		M 40

Motor Type		four-stroke single-cylindervertical

Bore x Stroke		68 x 68 mm

Displacement		247 ccm

Max Power		6,5 hp at 4500 rpm

Compression Ratio		6.0 : 1

Valves		ohv

Carburetion System		1 x carburettor BMW Spezial 20 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		6 / 9.28 / 13.7

Rear Wheel Ratio		1 : 2.84

Bevel / Crownwheel		14 / 37 teeth


Electrical system

Ignition System		Bosch magneto generator type G 1.8 V/15 W

Generator		Bosch magneto ignition

Spark Plugs		Bosch W 175

Chassis

Designation		R 39

Frame		twin-loop tubular frame

Front Wheel Suspension		plate spring, 4 laminae

Rear Wheel Suspension		rigid

Wheel Rims		27 x 3.5 type CC I

Tyres front		27 x 3.5 balloon or with 26 x 3 high-pressure tyres

Tyres rear		27 x 3.5 balloon or with 26 x 3 high-pressure tyres

Brakes front		internal shoe brake (drum brake) Ø 150 mm

Brakes rear		external shoe brake at the gearing (on cardan shaft)


Dimensions / Weights

Length x Width x Height		2050 x 800 x 950 mm

Fuel Tank Capacity		10 l

Unladen Weight, Full Tank		110 kg

Fuel Consumption		approx. 2,5 l/100 km

Oil Consumption		approx. 1-2 l/1000 km

Top Speed		100 kph