Start of Production

1937

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End of Production

1940

Numbers Produced

15,386

Price

995 RM

Engine

 

Internal Designation

M 69 and 235

Motor Type

Four-stroke single cylinder vertical

Bore x Stroke

72 x 84 mm (2.83 x 3.30 in)

Displacement

342 cc

Max Power

14 hp at 3,500 rpm

Compression Ratio

6.0 : 1

Valves

OHV

Carburation System

1 carburettor, SUM type C K 9/22

Engine Lubricating System

Forced feed lubrication

Oil Pump

Gear pump



Power Transmission

 

Clutch

Single plate, dry

Number of Gears

4

Shifting

Manual

Gearbox Ratios

3.4 / 2.18 / 1.35 / 1

Rear Wheel Ratio

1 : 5.63

Bevel/Crownwheel

8 / 45 teeth



Electrical System

 

Ignition System

Battery ignition

Generator

Bosch RD 47/70 2800

Spark Plugs

Bosch W 175 T1 or Beru K 175






Chassis

 

Designation

235

Frame

Pressed steel twin loop 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 180 mm / 7.08 in diameter

Brakes, Rear

Drum brake 180 mm / 7.08 in diameter




Dimensions/Weights

 

Length x Width x Height

2000 x 800 x 950 mm (78.74 x 31.49 x 37.40 in)

Wheel Base

1400 mm / 55.11 in

Fuel Tank Capacity

12 litres / 2.63 gal / 3.17 gal US

Unladen Weight with Full Tank

155 Kg / 341 lb

Permitted Weight Limit

200 Kg / 440 lb

Clearance

114 mm / 4.48 in

Fuel Consumption

3 litres 100 Km approx. / 94 mpg / 78 mpg US

Oil Consumption

1 - 2 litres per 1,000 Km approx.

Top Speed

100 Kph / 62 mph

Information kindly supplied by P.Hawksley

www.bmbikes.co.uk