Start of Production

1952

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End of Production

1954

Numbers Produced

4,234

Price

3,235 DM

Engine

 

Internal Designation

267/2

Motor Type

Four-stroke two cylinder flat twin

Bore x Stroke

72 x 73 mm (2.83 x 2.87 in)

Displacement

594 cc

Max Power

28 hp at 5,600 rpm

Compression Ratio

6.5 : 1

Valves

OHV

Carburation System

2 x carburettor, type Bing 1/24/15 - 1/24/16 or 1/24/25 - 1/24/26

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

4.0 / 2.28 / 1.7 / 1.3

Rear Wheel Ratio

1 : 3.56 (1 : 4.38 with sidecar)

Bevel/Crownwheel

9 / 32 teeth (8 / 35 with sidecar)



Electrical System

 

Ignition System

Magneto ignition

Generator

Noris 6 V L 45/60 L

Spark Plugs

Bosch W 240 T1






Chassis

 

Designation

251/4

Frame

Double loop steel tubular 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 brake 200 mm / 7.87 in diameter duplex, from 1954 full hub

Brakes, Rear

Drum brake 200 mm / 7.87 in diameter simplex, from 1954 full hub




Dimensions/Weights

 

Length x Width x Height

2130 x 790 x 985 mm (83.85 x 31.10 x 38.77 in)

Wheel Base

1400 mm / 5.51 in

Fuel Tank Capacity

17 litres / 3.73 gal / 4.49 gal US

Unladen Weight with Full Tank

192 Kg / 422 lb (with original sidecar, 320 Kg / 704 lb)

Idle/Riding Noise

85/87 phon

Load Rating

355 Kg / 781 lb (with original sidecar, 600 Kg / 1321 lb)

Fuel Consumption

4.6 litres 100 Km approx / 61 mpg / 51 mpg US

Oil Consumption

0.7 litres per 1,000 Km approx.

Top Speed

145 Kph / 90 mph (with original sidecar, 110 Kph / 68 mph)

Information kindly supplied by P.Hawksley

www.bmbikes.co.uk