BMW R 71

BMW R 71 Date 1938 - 1941

Number sold 3.458

Price 1.595,- RM

Engine

internal designation 271 / 1
engine type four-stroke two-cylinder flat-twin
Bore/stroke 78 x 78 mm
Cubic capacity 746 cm3
Max power 22 PS at 4600 U /min
Compression ratio 5,5 : 1
Valves per cylinder sv
Carburation system 2 carburettor Typ Graetzin G 24
Engine lubrication forced-feed lubrication
oil pump gear pump

 
Power transmission

Clutch single discs, dry
Number of gears 4
shifting foot shifting (+ auxiliary manual lever on the gear block)
Gear ratios 3,6 / 2,28 / 1,7 / 1,3
Rear wheel ratio 1 : 3,6 (sidecar 1 : 3,89)
Bevel/crown wheel 10 / 36 teeth (with sidecar 9 / 35)

 
Electrical system

Alternator Bosch RD 50/6 2800 RS 17
Ignition battery ignition
Spark plugs Bosch W 175 T 1

 
Suspension

designation 251 / 1
Type of frame twin-loop steel tubular frame
Front suspension telescopic fork
Rear suspension telescopic fork
wheel rims deep-bed 3 x 19
Tyres front 3,50 x 19
Tyres rear 3,50 x 19
Brakes front drum brake, 200 mm
Brakes rear drum brake, 200 mm

 
Dimensions and weights

Length x width x height 2130 x 815 x 960 mm
Wheel base 1400 mm
Tank capacity 14 l
Unladen weight, full tank 187 kg
load rating 210 kg ((max. overall weight with sidecar 500 kg)
Fuel consumption ca. 4,5 l / 100 km
oil consumption ca. 1 l / 1000 km
Top speed 125 km/h (with sidecar 105 km/h)