The BMW R 90S was produced between 1973 and 1976, with a total of 17,465 units built. It features a four-stroke, two-cylinder horizontally opposed boxer engine with pushrod-operated two valves per cylinder, 898 cc capacity, and a compression ratio of 9.5:1. It is air-cooled and has a gear-driven pump for lubrication. The bike has a maximum power of 48.8 kW (67 hp) at 7000 rpm and a maximum torque of 76 Nm (55 ft-lb) at 5500 rpm. The clutch is a dry single plate with diaphragm spring, and it is equipped with a five-speed transmission and a shaft final drive. The front suspension is a telescopic fork with hydraulic shock absorber, while the rear suspension is a long swinging arm with an adjustable strut. The front brakes consist of two 260mm discs with a one-piston caliper, while the rear brake is a 200mm drum. The bike has 1.85 – B19 front wheel and a 2.15 – B18 rear wheel with dimensions of 2180 mm x 740 mm x 1210 mm (L x W x H) and a wheelbase of 1465 mm. It has a seat height of 820 mm and weighs 215 kg (473 lbs) with a 24-liter (6.3 US gal) fuel capacity. The bike has an average fuel consumption of 5.1 L/100 km (46 mpg) and a top speed of 200 km/h (124 mph). It is well-reviewed by Motorcycle-USA and Top Speed, with standing 1/4-mile times of 13.3 sec at 163 km/h (101 mph).
Make Model: BMW R 90S
Year: 1973-76
Production: 17465 units
Engine: Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
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