BMW R42: history, specs, pictures

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1926 BMW R42

Production 1926 - 1928
two cylinder boxer, four-stroke
Bore / Stroke 68.0mm x 68.0mm
Top Speed 59 mph (95 km/h)
Horsepower 11.67 HP (8.7 KW) @ 3400RPM
Fuel System carburetor. 20mm bmw spezial
Transmission Gear box: 3-speed

Final Drive: shaft drive (cardan)

Clutch: dry-single plate-cable operated
Suspension Front: leading link
Rear: rigid
Brakes Front: expanding brake (drum brake)
Front Tire 3.5-26
Rear Tire 3.5-26
Wheelbase 55.51 inches (1410 mm)
Length 82.68 inches (2100 mm)
Width 31.5 inches (800 mm)
Height 37.4 inches (950 mm)
Weight 126.0 kg (wet)
Fuel Consumption 3.00 liters/100 km (33.3 km/l or 78.41 mpg)
Manuals Service Manual

The BMW R42 was a two cylinder boxer, four-stroke standard produced by BMW between 1926 and 1928. It could reach a top speed of 59 mph (95 km/h). Claimed horsepower was 11.67 HP (8.7 KW) @ 3400 RPM.


The engine was a air cooled two cylinder boxer, four-stroke. A 68.0mm bore x 68.0mm stroke result in a displacement of just 494.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).


The bike has a 3-speed transmission. Power was moderated via the dry-single plate-cable operated.


It came with a 3.5-26 front tire and a 3.5-26 rear tire. The front suspension was a leading link while the rear was equipped with a rigid. The wheelbase was 55.51 inches (1410 mm) long.