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BMW R25/3 Specifications

 

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Start of Production

1953

BMW R25/3

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End of Production

1956

Numbers Produced

47,700

Price

2,060 DM

Engine

 

Internal Designation

224/4

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

13 hp at 5,800 rpm

Compression Ratio

7.0 : 1

Valves

OHV

Carburation System

1 x Bing type 1/24/41 or SAWE type K 24 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

4.16 : 1 (with sidecar 4.8 : 1)

Bevel/Crownwheel

6 / 25 teeth (with sidecar 5 / 24)

Electrical System

 

Ignition System

Battery ignition

Generator

Noris ZLZ 60/6/1600 L

Spark Plugs

Bosch W 240 T1

Chassis

 

Designation

225/3

Frame

Closed steel twin loop frame, welded

Front wheel suspension

Telescopic fork

Rear wheel suspension

Telescopic suspension

Wheel rims

3 x 18 deep bed

Tyres, Front

3.25 x 18

Tyres, Rear

3.25 x 18

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

2065 x 760 x 730 mm (81.29 x 29.92 x 28.74 in)

Wheel Base

1365 mm / 53.74 in

Fuel Tank Capacity

12 litres / 2.63 gal / 3.17 gal US

Unladen Weight with Full Tank

150 Kg / 330 lb

Permitted Weight Limit

320 Kg / 704 lb (with original sidecar 450Kg / 991 lb)

Clearance

92 mm / 3.62 in

Idle/Riding Noise

82/84 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

119 Kph / 73 mph (with original sidecar 88 Kph / 54 mph)

 

 

 

 

 

 

Member of BM Riders Club, The BMW Club, BMF, BMWMOA, The Airheads and The Poverty Riders

Check out my other sites at: www.bmridersclub.com & www.boxerman.co.uk