Information kindly supplied by P.Hawksley

www.bmbikes.co.uk

Start of Production

1951

Click to View Available Literature

End of Production

1953

Numbers Produced

38,651

Price

1,990 DM

Engine

 

Internal Designation

224/3

Motor Type

Four-stroke single cylinder vertical

Bore x Stroke

68 x 68 mm (2.67 x 2.67 in)

Displacement

247 cc

Max Power

12 hp at 5,800 rpm

Compression Ratio

6.5 : 1

Valves

OHV

Carburation System

1 x Bing type 1/22/44 or SAWE type K 22 F

Engine Lubricating System

Forced feed lubrication

Oil Pump

Gear pump



Power Transmission

 

Clutch

Single plate, dry

Number of Gears

4

Shifting

Foot switching (+ auxiliary manual switch on gearing block)

Gearbox Ratios

6.1 / 3.0 / 2.04 / 1.54

Rear Wheel Ratio

4.5 :1 (with sidecar 5.14 :1)

Bevel/Crownwheel

6 / 27 teeth (with sidecar 7 / 36)



Electrical System

 

Ignition System

Battery ignition

Generator

Noris ZLZ 45/60; 6V/max. 60 W

Spark Plugs

Bosch W 240 T1






Chassis

 

Designation

225/2

Frame

Closed steel twin loop frame, welded

Front wheel suspension

Telescopic fork

Rear wheel suspension

Pushrod suspension

Wheel rims

3 x 19 deep bed

Tyres, Front

3.25 x 19

Tyres, Rear

3.25 x 19

Brakes, Front

Drum brake 160 mm / 6.29 in diameter

Brakes, Rear

Drum brake 160 mm / 6.29 in diameter




Dimensions/Weights

 

Length x Width x Height

2020 x 790 x 730 mm (Saddle) (79.52 x 31.10 x 28.74 in)

Wheel Base

1335 mm / 52.55 in

Fuel Tank Capacity

12 litres / 2.63 gal / 3.17 gal US

Unladen Weight with Full Tank

142 Kg / 312 lb

Permitted Weight Limit

300 Kg / 660 lb (with sidecar 375 Kg / 825lb)

Clearance

108 mm / 4.25 in

Idle/Riding Noise

84/85 phon

Fuel Consumption

Approx. 2.9 litres per 100 Km / 97 mpg / 81 mpg US

Oil Consumption

Approx. 0.7 litres per 1,000 Km

Top Speed

105 Kph / 65 mph (with original sidecar 80 Kph / 49 mph)