BMW R20

Make Model	BMW R 20
Year	1938-40
Engine	Four stroke, single cylinder, pushrod operated, OHV, 2 valves per cylinder.
Capacity	192 cc / 11.7 cu in.
Bore x Stroke	68 x 68 mm
Compression Ratio	6.0:1
Cooling System	Air cooled
Induction	1 x Amal push in carburetor M 74/428
Ignition	Battery ignition
Starting	Kick
Clutch	Single plate, dry
Max Power	6 kW / 8 hp @ 5400 rpm
Transmission	3 Speed
Final Drive	Shaft
Gear Ratio	1st 4.55 / 2nd 2.58 / 3rd 1.64:1
Frame	Twin loop frame, bolted
Front Suspension	Telescopic fork
Rear Suspension	Rigid, spring loaded saddle
Front Brake	∅160mm Drum
Rear Brakes	∅180mm Drum
Front Tyre	3.00 x 19"
Rear Tyre	3.00 x 19"
Wet-Weight	130 kg / 296 lb
Fuel Capacity	12 L / 3.2 US gal

The rotor of the 6V/50W alternator voltage power for the board was now sitting right on the front crankshaft journal. The contact breaker ignition was now different than the predecessor model R 2 is actuated by the crankshaft journal. The battery was now behind the transmission, underneath the driver's seat.

A dry clutch and a hand like so far, but now also footswitchable 3-speed transmission formed together with the cardan shaft to the drive.

The suspension consisted of a tubular frame with no rear suspension bolted. The front wheel was given a guided tour with fork . The front and rear brakes were the then state of the art executed in accordance with hub brakes than half.

BMW R 20