Start of Production

1936

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End of Production

1937

Numbers Produced

2,652

Price

1,550 RM

Engine


Internal Designation

254

Motor Type

Four-stroke two cylinder flat twin

Bore x Stroke

68 x 68 mm (2.67 x 2.67 in)

Displacement

494 cc

Max Power

24 hp at 5,500 rpm

Compression Ratio

6.7 : 1

Valves

OHV

Carburation 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)

Gearbox Ratios

3.6 / 2.28 / 1.7 / 1.3

Rear Wheel Ratio

1 : 3.89 (1 : 4.62 with sidecar)

Bevel/Crownwheel

9 / 35 teeth (8 / 37 with sidecar)



Electrical System


Ignition System

Battery ignition

Generator

Bosch RD 45/6 2800 RS 15

Spark Plugs

Bosch W 225 T1






Chassis


Designation

250

Frame

Twin loop pressed steel frame

Front wheel suspension

Telescopic fork

Rear wheel suspension

Rigid

Wheel rims

3 x 19

Tyres, Front

3.5 x 19

Tyres, Rear

3.5 x 19

Brakes, Front

Drum brake 200 mm / 7.87 in diameter

Brakes, Rear

Drum brake 200 mm / 7.87 in diameter




Dimensions/Weights


Length x Width x Height

2130 x 800 x 950 mm (83.85 x 31.49 x 37.40 in)

Wheel Base

1400 mm / 55.11 in

Fuel Tank Capacity

15 litres / 3.29 gal / 3.96 gal US

Unladen Weight with Full Tank

165 Kg / 363 lb

Load Rating

210 Kg / 462 lb

Fuel Consumption

Approx. 3 litres per 100 Km / 94 mpg / 78 mpg US

Oil Consumption

Approx. 1 litre per 1,000 Km

Top Speed

140 Kph / 87 mph

Information kindly supplied by P.Hawksley

www.bmbikes.co.uk