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BMW R 39

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Make Model

BMW R 39

Year

1925-27

Engine

Four stroke, single cylinder vertical, OHV

Capacity

247 cc / 15.1 cu in.
Compression Ratio

6.0:1

Cooling System Air cooled

Induction

1 x BMW Spezial ∅20 mm

Ignition

Bosch magneto generator type G 1.8V/15W

Starting

Kick

Clutch Single plate, dry

Max Power

4.8 kW / 6.5 hp @ 4000 rpm

Transmission

3 Speed 

Final Drive

Shaft
Frame Twin loop tubular frame

Front Suspension

Plate spring, 4 laminae

Rear Suspension

Rigid, spring loaded saddle

Front Brakes

Internal shoe drum brake ∅150 mm / ∅5.90 in diameter

Rear Brakes

External shoe brake at the gearing on Cardan shaft

Front Tyre

27 x 3.5" balloon or with 26 x 3.0" high pressure tyres

Rear Tyre

27 x 3.5" balloon or with 26 x 3.0" high pressure tyres

Wet-Weight

110 kg / 242 lbs

Fuel Capacity 

10 liters / 2.6 US gal
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