BMW R63: history, specs, pictures

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Production 1928 - 1929
two cylinder boxer, four-stroke
Bore / Stroke 83.0mm x 68.0mm
Top Speed 75 mph (120 km/h)
Horsepower 23.6 HP (17.6 KW) @ 4000RPM
Fuel System carburetor. 24mm
Transmission Final Drive: shaft drive (cardan)
Clutch: dry-single plate-cable operated
Suspension Front: leading link
Brakes Front: expanding brake (drum brake). single
Front Tire 3.50-26.00
Rear Tire 3.50-26.00
Wheelbase 55.12 inches (1400 mm)
Length 82.68 inches (2100 mm)
Width 31.5 inches (800 mm)
Height 37.4 inches (950 mm)
Weight 152.0 kg (wet)
Fuel Capacity 3.3 Gallon (12.50 Liters)
Manuals Service Manual

The BMW R63 was a two cylinder boxer, four-stroke standard produced by BMW between 1928 and 1929. It could reach a top speed of 75 mph (120 km/h). Claimed horsepower was 23.6 HP (17.6 KW) @ 4000 RPM.

Development of the BMW engine proceeded rapidly throughout the 1920s, with the first 750cc models, the BMW R62 and R63, arriving in 1928. A side valve tourer, the former employed the same long-stroke (78mm) built-up crankshaft as the new 486cc R52, while the sporting overhead-valve R63 featured a short-stroke (68mm) crank coupled with a 83mm bore. These new engines incorporated a strengthened gearbox featuring a 'side-throw' kickstart, while the cycle parts were upgraded with a larger front brake. Electric lighting was now standard on all BMW models. A spirited performer on the road, the R63 was also raced by the works alongside its 500cc stablemates and, like the latter, pioneered the factory's use of supercharging. Although a relatively modest 75mph maximum was claimed for the stock R63, it was a modified version that provided BMW with the means of securing its first motorcycle land speed record, when Ernst Henne achieved a maximum of 133.8mph on a 'blown' example in 1929.

The arrival of the fashionable 'saddle' fuel tank at the end of the 1920s meant that BMW's distinctive wedge-shaped tank had to go. The resulting wholesale revision of the design undertaken for 1929 would later confer iconic status on these early BMWs, none more so than the R63, which enjoys great historical significance as the Munich firm's first ohv 750 roadster. Approximately 800 were made.

Engine[edit | edit source]

The engine was a air cooled two cylinder boxer, four-stroke. A 83.0mm bore x 68.0mm stroke result in a displacement of just 735.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).

Drive[edit | edit source]

Power was moderated via the dry-single plate-cable operated.

Chassis[edit | edit source]

It came with a 3.50-26.00 front tire and a 3.50-26.00 rear tire. The R63 was fitted with a 3.3 Gallon (12.50 Liters) fuel tank. The wheelbase was 55.12 inches (1400 mm) long.

1929 BMW R 63[edit | edit source]

The 1928 BMW R 63 has, at its heart, an air-cooled, four-stroke, 745cc, single vertical cylinder engine mated to a three-speed manual transmission and can produce a claimed 24 horsepower at 3400 rpm. It also boasts features such as a plate spring fork as a front suspension, a hard-tail rear unit, a sprung single seat, a front drum brake coupled to an external shoe brake at the gearing on the cardan shaft in the rear, laced wheels, a twin loop steel tubular frame a large headlight and a rear luggage rack.

Photos[edit | edit source]