BMW R63

Make Model	BMW R 63
Year	1928 - 29
Engine	Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Capacity	745 cc / 45.5 cu in.
Bore x Stroke	83 x 68 mm
Compression Ratio	6.2:1
Cooling System	Air cooled
Induction	1 x Spezial 2 valve ∅24 mm carburetor
Ignition / Starting	Bosch high voltage magneto ignition
Starting	Kick
Clutch	Single plate, dry
Max Power	17.9 kW / 24 hp @ 3400 rpm
Transmission / Drive	3 Speed
Gear Ratio	1st 2.83 / 2nd 1.55 / 3rd 1.08:1
Frame	Twin loop steel tubular frame
Front Suspension	Plate spring, 6 laminae
Rear Suspension	Rigid, spring loaded saddle
Front Brakes	∅200mm Drum
Rear Brakes	External shoe brake at the gearing on Cardan shaft
Front Tyre	26 x 3.5" or 19 x 3.0" or 27 x 2.75" or 21 x 2.5"
Rear Tyre	26 x 3.5" or 19 x 3.0" or 27 x 2.75" or 21 x 2.5"
Wet-Weight	152 kg / 334 lb
Fuel Capacity	12.5 liters / 3.3 US gal

This first o.h.v. 750 from BMW in 1928 was effectively a development of the 500cc R57, and its oversquare, 83 x 68mm engine provided an exhilarating performance by the standards of its day. The valve gear was completely enclosed, and although the three-speed gearbox and the cycle parts were similar to those introduced on the R32 five years earlier, everything was stronger. The front brake was bigger and the rear brake was now a heel-operated device contracting around a drum at the front end of the driveshaft.

BMW R 63