BMW R23

Make Model	BMW R 23
Year	1938 - 40
Engine	Four stroke, single cylinder, pushrod operated, OHV, 2 valves per cylinder.
Capacity	247 cc / 15.1 cu in.
Bore x Stroke	68 x 68 mm
Compression Ratio	6.75:1
Cooling System	Air cooled
Induction	1x Bing type AJ 1/22/140
Ignition	Battery ignition
Starting	Kick
Clutch	Single plate, dry
Max Power	8.9 kW / 12 hp @ 5600 rpm
Transmission	3 Speed
Final Drive	Shaft
Gear Ratio	1st 4.55 / 2nd 2.58 / 3rd 1.64:1
Frame	Closed steel twin loop frame, welded
Front Suspension	Telescopic fork
Rear Suspension	Rigid, spring loaded saddle
Front Brake	∅160mm Drum
Rear Brakes	∅160mm Drum
Front Tyre	3.00 x 19"
Rear Tyre	3.00 x 19"
Wet-Weight	135 Kg / 297 lb
Fuel Capacity	9.6 L / 2.5 US gal

The BMW R 23 is a motorcycle, which appeared in 1938. It was the successor to the R 20 . As from 1938, also for motorcycles to 200 cc, a control and driver's license was required, but a new license category was introduced to 250 cc, BMW took the opportunity of increasing engine displacement to 250 cc.

The high degree of technical compliance of the R20 and R23 models offered by BMW even a conversion kit for the displacement to 250 cc for R 20.

The powertrain, chassis, brakes, front fork and ignition system are identical to the model R 20 Only the alternator for the vehicle's voltage system now delivers 6V/75W. The R 23 is the original version since then, all 250 single-cylinder BMW motorcycle with shaft drive, which were built until 1966, designed as a high quality, low maintenance and economical everyday cars.