BMW R90/6

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BMW R 90/6
Production 1973
Class Standard
air-cooled, four-stroke, two cylinder boxer, 2 valves per cylinder
Bore / Stroke 88.9mm x 88.9mm
Compression ratio 9.0:1
Horsepower 59.94 HP (44.7 KW) @ 6500RPM
Torque 53.84 ft/lbs (73.0 Nm) @ 5500RPM
Spark Plug NGK BP6ES
Battery YUASA Y60-N24AL-B
Transmission Gear box: 5-speed, manual

Final Drive: shaft

Clutch: dry, single plate, diaphragm spring
Suspension Front: telescopic hydraulic fork
Rear: dual adjustable shocks
Brakes Front: single 260mm disc, 1-piston caliper
Rear: 200mm drum
Front Tire 3.25-H19
Rear Tire 4.00-H18
Wheelbase 57.6 inches (1463 mm)
Length 85.79 inches (2179 mm)
Width 29.09 inches (739 mm)
Seat Height 31.89 inches (810 mm)
Weight 210.0 kg (wet)
Manuals Service Manual

The BMW R 90/6 was a air-cooled, four-stroke, two cylinder boxer, 2 valves per cylinder Naked motorcycle produced by BMW in 1973. Max torque was 53.84 ft/lbs (73.0 Nm) @ 5500 RPM. Claimed horsepower was 59.94 HP (44.7 KW) @ 6500 RPM.


A 88.9mm bore x 88.9mm stroke result in a displacement of just 898.0 cubic centimeters.


The bike has a 5-speed, manual transmission. Power was moderated via the dry, single plate, diaphragm spring.


It came with a 3.25 - H19 front tire and a 4.00 - H18 rear tire. Stopping was achieved via single 260mm disc, 1-piston caliper in the front and a 200mm drum in the rear. The front suspension was a telescopic hydraulic fork while the rear was equipped with a dual adjustable shocks. The wheelbase was 57.6 inches (1463 mm) long.

1973 - 1976 BMW R 90/6[edit]

1973 - 1976 BMW R 90/6 1973 - 1976 BMW R 90/6 1973 - 1976 BMW R 90/6

The 1973 BMW R 90/6 has, at its heart, an air-cooled, four-stroke, 898cc, two cylinder boxer powerhouse paired to a five-speed manual transmission that can reach a maximum power output of 60 horsepower and 73 Nm of torque.

In addition, it boasts standard fittings such as a telescopic hydraulic front fork, dual shock absorbers as a rear suspension, a front disc brake coupled to a drum rear unit, a dual seat with pillion grab rails, a large, round headlight, laced wheels, a dual exhaust system and an analogue instrument cluster.

In Media[edit]