BMW R 47

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BMW R 47
Production 1928
Class Classic
air-cooled, four-stroke, boxer twin cylinder, OHV
Bore / Stroke 68.6mm x 68.6mm
Compression ratio 5.8:1
Horsepower 17.97 HP (13.4 KW) @ 4000RPM
Transmission Gear box: 3 speed, manual

Final Drive: shaft

Clutch: dry, single plate
Suspension Front: plate spring, 5 laminae
Rear: hard-tail, sprung seat
Brakes Front: 150mm drum
Rear: external shoe brake at the gearing (on cardan shaft)
Front Tire 27 x 3.5
Rear Tire 27 x 3.5
Wheelbase 55.51 inches (1410 mm)
Length 82.68 inches (2100 mm)
Width 30.98 inches (787 mm)
Weight 130.0 kg (wet)
Manuals Service Manual

The BMW R 47 was a air-cooled, four-stroke, boxer twin cylinder, OHV Classic motorcycle produced by BMW in 1928. Claimed horsepower was 17.97 HP (13.4 KW) @ 4000 RPM.


A 68.6mm bore x 68.6mm stroke result in a displacement of just 494.0 cubic centimeters.


The bike has a 3 speed, manual transmission. Power was moderated via the dry, single plate.


It came with a 27 x 3.5 front tire and a 27 x 3.5 rear tire. Stopping was achieved via 150mm drum in the front and a external shoe brake at the gearing (on cardan shaft) in the rear. The front suspension was a plate spring, 5 laminae while the rear was equipped with a hard-tail, sprung seat. The wheelbase was 55.51 inches (1410 mm) long.

1928 BMW R 47[edit]

1928 BMW R 47 1928 BMW R 47

The House of Munich has launched the 1927 R 47 with an air-cooled, four-stroke, 494cc, boxer twin cylinder powerplant mated to a three-speed manual transmission, that could produce a claimed 18 horsepower at 4000 rpm. It comes with a front drum brake, a plate spring fork, a hard-tail rear suspension, a single sprung seat, a rear luggage rack, pull-back handlebars, laced wheels, long fenders, and a small luggage rack in the front.