BMW R90S (1973)

Technical Specifications
1973 BMW R90S
Engine
Engine type
Bore x Stroke
Displacement
Valves
Compression ratio
Max Power
Max Torque
Fuel system
Transmission
Final drive
Clutch
Ignition type
Starting system
Lubrication
Exhaust
Spark plug
Generator
Gear ratios

Four-stroke two cylinder horizontally opposed "Boxer" engine, air cooled
90.0 x 70.6 mm (3.54 x 2.77 inches)
898 cc
2 valves per cylinder; OHV, using push rod and rocker arm
9.5:1
67 hp (49.3 KW) @ 7000 rpm
76 Nm / 56 ft lb @ 5500 rpm
2 slide carburettors, Dellorto PHM 38 AS-AD or 38 BS-BD
5-speed; Dog type gearbox (ratchet foot lever)
Cardan
Dry single plate, with lever action diaphragm spring
Battery ignition
Electric starter
Wet sump

Bosch W 200 T 30 / Beru 200/14/3 A / Champion N7Y

4.4 / 2.86 / 2.07 / 1.67 / 1.50
Dimensions
Frame type
Castor
Overall length
Overall width
Overall height
Wheelbase
Seat height
Ground clearance
Dry weight
Fuel capacity
Colors
Suspension (front)
Suspension (rear)
Tyre (front)
Tyre (rear)
Brake (front)
Brake (rear)

Double loop tubular frame with bolt on rear section

2180 mm (85.82 inches)
740 mm (29.13 inches)
1210 mm (47.63 inches)
1465 mm (57.67 inches)
820 mm
165 mm
215 kg
24 litres

Telescopic fork with hydraulic shock absorber
Long swinging arm with adjustable strut
3.25 H 19
4.00 H 18
Dual disc brake 260 mm / 10.23 in diameter. ATE 1 piston caliper
Simplex drum brake 200 mm / 7.87 in diameter

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