BMW Motorcycles

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BMW R47 500cc 1927

BMW R47 500cc OHV Twin

Developed from the R37, the OHV R47 shared many features with its new sidevalve sibling, the R42. Much effort had been expended creating a machine which was both considerably more powerful and much cheaper to manufacture. Available with numerous options including horn and electric headlight, it had improved brakes, with the rear brake mounted on the cardan shaft.

1720 of these were sold over its two year production life, fully ten times more than the R37.

Production Years: 1927-1928
Displacement: 494 cc
Engine: 4-stroke OHV Type M 51
Compression Ratio: 5.8:1
Cylinders: 2
Power: 18 hp @ 4,000 rpm
Weight: 130 kg dry
Top speed: 110 km/h
Fuel tank capacity: 14 litres (larger available as an option)
Production numbers: 1720