BMW R 12 - 2 carburettor

BMW R 12 - 2 carburettor Date 1935 - 42

Number sold 36.000 (single- and doublecarburettor-Version)

Price 1.630,- RM

Engine

Internal Designation M 56 S 6 or 212
Engine type four-stroke two-cylinder flat-twin
Bore/stroke 78 x 78 mm
Cubic capacity 745 cm3
Max power 20 PS at 3400 rpm
Compression ratio 5,2 : 1
Valves per cylinder sv
Carburation system 2 Amal 6 / 406 / 407
Engine lubrication forced-feed lubrication
Oil pump gear pump

Power transmission

Clutch double discs, dry
Number of gears 4
Shifting manual
Gear ratios 3,18 / 2,06 / 1,42 / 1,09
Rear wheel ratio 1 : 4,07 (sidecar 1 : 4,75)
Bevel/crown wheel 14 / 57 teeth (sidecar 12 / 57)

Electrical system

Alternator Bosch B 245 RS 108
Ignition Magnet- or battery ignition
Spark plugs Bosch M 175 T 1 or Bosch W 175 T 1

Suspension

Designation F 66
Type of frame twin-loop pressed steel frame
Front suspension telescopic fork
Rear suspension rigid
wheel rims 3 x 19
Tyres front 3,50 x 19
Tyres rear 3,50 x 19
Brakes front drum brakes, 200 mm
Brakes rear drum brakes, 200 mm

Dimensions and weights

Length x width x height 2100 x 900 x 940 mm
Wheel base 1380 mm
Tank capacity 14 l
Unladen weight, full tank ca. 185 kg
Load rating 300 kg
Fuel consumption 4 - 4,5 l / 100 km
Oil consumption 1 - 2 l / 1000 km
Top speed 120 km/h

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