BMW R90/6
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.
 |
|
| BMW R 90/6 | |
| Manufacturer | |
|---|---|
| Production | 1973 |
| Class | Standard |
| Engine | 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 |
| 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 |
EngineEdit
A 88.9mm bore x 88.9mm stroke result in a displacement of just 898.0 cubic centimeters.
DriveEdit
The bike has a 5-speed, manual transmission. Power was moderated via the dry, single plate, diaphragm spring.
ChassisEdit
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 90/6Edit
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.