BMW R61

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BMW R61
Manufacturer BMW
Also called R 61
Production 1938 - 1941
Class Classic
Engine two cylinder boxer, four-stroke
Bore / Stroke 70.0mm x 78.0mm
Compression ratio 5.7:1
Top speed 71 mph (115 km/h)
Horse Power 17.57 HP (13.1 KW) @ 4800RPM
Battery 5.7:1
Transmission Gear box: 4-speed

Final Drive: shaft drive (cardan)

Clutch: dry-single plate-cable operated
Suspension Front: leading link
Rear: twin shock-swingarm
Brakes Front: expanding brake (drum brake). single
Rear: expanding brake (drum brake)
Front Tire 3.50-19.00
Rear Tire 3.50-19.00
Wheelbase 55.12 inches (1400 mm)
Dimensions L 83.86 inches (2130 mm)
W 32.09 inches (815 mm)
H 37.8 inches (960 mm)
Weight  (dry), 184.0 kg (wet)
Fuel capacity 3.7 Gallon (14.00 Liters)
Fuel consumption 3.50 litres/100 km (28.6 km/l or 67.21 mpg)
Manuals Service Manual
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The BMW R61 was a two cylinder boxer, four-stroke Classic motorcycle produced by BMW between 1938 and 1941. It could reach a top speed of 71 mph (115 km/h). Claimed horsepower was 17.57 HP (13.1 KW) @ 4800 RPM.

Engine[edit]

The engine was a air cooled two cylinder boxer, four-stroke. A 70.0mm bore x 78.0mm stroke result in a displacement of just 600.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).

Drive[edit]

The bike has a 4-speed transmission. Power was moderated via the dry-single plate-cable operated.

Chassis[edit]

It came with a 3.50-19.00 front tire and a 3.50-19.00 rear tire. Stopping was achieved via expanding brake (drum brake). single in the front and a expanding brake (drum brake) in the rear. The front suspension was a leading link while the rear was equipped with a twin shock-swingarm. The R61 was fitted with a 3.7 Gallon (14.00 Liters) fuel tank. The wheelbase was 55.12 inches (1400 mm) long.

1938 - 1941 BMW R 61[edit]

1938 - 1941 BMW R 61 1938 - 1941 BMW R 61 1938 - 1941 BMW R 61 1938 - 1941 BMW R 61

The 1938 BMW R 61 has, at its heart, an air-cooled, four-stroke, 600cc, single vertical cylinder powerhouse paired to a four-speed manual transmission that can produce a claimed 18 horsepower at 4800 rpm. It also comes with a single, sprung seat, wide handlebars, a large headlamp, a rear luggage rack, laced wheels, a telescopic front fork, plunger shocks in the rear, a front drum brake coupled to an external shoe brake at the gearing on cardan shaft and a dry, single plate clutch.


In Media[edit]