The BMW R90S, a masterpiece of German engineering, stood out as a refined and expensive sports-tourer in the mid-1970s. Its flat-twin engine, a perfect blend of power and comfort, delivered 67bhp at 7,000rpm, propelling the bike to a top speed of 125mph. The R90S’s distinctive smoked paint scheme and aggressive styling, courtesy of Hans Muth, made it a head-turner on the road.
The bike’s engine, an evolution of the R75’s, boasted a higher compression ratio and breathed in through big 38mm Dell’Orto carbs with accelerator pumps, making it a force to be reckoned with on the highway.
With its relaxed high-speed cruising ability, fine handling, and impeccable finish, the R90S was the ultimate all-round superbike of its day, offering a riding experience that was both exhilarating and comfortable. The result was a machine that excelled in every department, making it a true legend of the motorcycle world.
BMW’s R90S was the best of the best, a true masterpiece of engineering that remains an iconic and coveted classic to this day.
Key Specifications
Engine Type
Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Engine Capacity
898 cc / 54.8 cu in.
Max Power
48.8 kw / 67 hp
Max Torque
76 Nm / 7.6 kgf-m / 55 ft-lb @ 5500 rpm
Fuel Tank Capacity
6.3 US gallons / 24.0 L
Weight (Wet/Kerb)
473 lbs / 215 kg
Seat Height
32.2 inches / 820 mm
*n/a – information not provided by manufacturer
All Specifications
Make & Model
Model
BMW R 90S
Year
1973 – 76
Engine
Engine Type
Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Displacement
898 cc / 54.8 cu in.
Bore x Stroke
90 x 70.6 mm
Compression Ratio
9.5:1
Max Horsepower
48.8 kw / 67 hp
Max Torque
76 Nm / 7.6 kgf-m / 55 ft-lb @ 5500 rpm
Engine Management System
2 x slide Dell’Orto PHM 38 carburetors
Lubrication System
Gear driven pump
Cooling System
Air cooled
Performance
Top Speed
200 km/h / 124 mph
*n/a – information not provided by manufacturer
Transmission
Clutch
Dry single plate, with diaphragm spring
Gearbox
5 Speed
Final Drive
Shaft
Electrical & Electronics System
Starter
Electric
Chassis & Suspension
Frame Type
Double-looptubularframewithbolt-onrearsection
Front Suspension
Telescopic fork with hydraulic shock absorber
Front Suspension Travel
8.1 inches / 208 mm
Rear Suspension
Long swinging arm with adjustable strut.
Rear Suspension Travel
4.9 inches / 125 mm
Wheels & Brakes
Front Wheel/Rim Size
1.85 – B19
Front Tire Size
3.25 – H19
Rear Wheel/Rim Size
2.15 – B18
Rear Tire Size
4.00 – H18
Front Brakes
2 x ∅260mm discs, 1 piston caliper
Rear Brakes
∅200mm Drum
Dimension & Weights
Seat Height
32.2 inches / 820 mm
Wheelbase
57.67 inches / 1465 mm
Ground Clearance
165 mm / 6.49 in
Fuel Tank Capacity
6.3 US gallons / 24.0 L
Wet (kerb/curb) Weight
473 lbs / 215 kg
Features
898cc horizontally opposed twin engine
9.5:1 compression ratio
38mm Dell’Orto carbs with accelerator pumps
67bhp at 7,000rpm
280W alternator
Revised gearchange mechanism
Stronger bottom end
Steering damper
Larger fuel tank
Second front brake disc
Twin-disc front brake system
Reliability
Impeccable finish
Smooth engine
Torquey mid-range response
Comfortable ride
Generous fuel range
Dashboard clock
Distinctive smoked paint scheme
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*We strive to provide the most comprehensive and accurate specifications possible. However, certain details may not be available if the manufacturer did not disclose them or if the information is no longer publicly accessible. If you find any discrepancy with any data on this site, please feel free to let us know at contact@throttlecraze.com
