BMW R3: history, specs, pictures

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The Depression years of the early 1930s brought with them the need for a simpler - and cheaper - model to compete with the lightweight two-strokes mopping up the lucrative up-to-200cc market. BMW responded with its second single-cylinder design – the 198cc BMW R2 – which appeared early in 1931 and sold well despite the difficult trading conditions, as did the 398cc R4, a favourite with the German Army. R3 (305cc) and R35 (347cc) singles appeared later in the 1930s, all enjoying the benefits of shaft drive like their larger siblings. Of these, the R3 is by far the rarest, being produced for the 1936 season only, during which time only 740 were made. Factory records show that this R3 was delivered to Moto-Lusa in Lisbon, Portugal in May 1936. Unrestored, the machine was first registered in the Netherlands in 1986 and was purchased for the Neutkens Collection in 1992. Noteworthy features include a Veigel-D-R-P 'Waltzentacho', quick-release fuel filler cap and a Bosch headlamp with Hella rim. Offered with Netherlands registration papers.


BMW R3
Manufacturer
BMW
Production 1936
Engine
single cylinder, four-stroke
Bore / Stroke 68.0mm x 84.0mm
Top Speed 62 mph (100 km/h)
Horsepower 10.73 HP (8.0 KW) @ 4200RPM
Fuel System carburetor. 18mm
Ignition battery
Transmission Final Drive: shaft drive (cardan)
Clutch: dry-single plate-cable operated
Suspension Front: cartridge
Rear: rigid
Brakes Front: expanding brake (drum brake)
Rear: expanding brake (drum brake)
Front Tire 3.50-26.00
Rear Tire 3.50-26.00
Wheelbase 51.97 inches (1320 mm)
Length 77.95 inches (1980 mm)
Width 33.46 inches (850 mm)
Height 37.4 inches (950 mm)
Weight 149.0 kg (wet)
Fuel Capacity 3.17 Gallon (12.00 Liters)
Fuel Consumption 3.00 liters/100 km (33.3 km/l or 78.41 mpg)
Manuals Service Manual


The BMW R3 was a single cylinder, four-stroke standard produced by BMW in 1936. It could reach a top speed of 62 mph (100 km/h). Claimed horsepower was 10.73 HP (8.0 KW) @ 4200 RPM.

Engine[edit]

The engine was a air cooled single cylinder, four-stroke. A 68.0mm bore x 84.0mm stroke result in a displacement of just 305.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).

Drive[edit]

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

Chassis[edit]

It came with a 3.50-26.00 front tire and a 3.50-26.00 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a cartridge while the rear was equipped with a rigid. The R3 was fitted with a 3.17 Gallon (12.00 Liters) fuel tank. The wheelbase was 51.97 inches (1320 mm) long.