BMW R 90 S

BMW R 90 S Date 1973 - 1976

Number sold 17.465

Price 8.510,- DM

Engine

Type four-stroke, two-cylinder, horizontally-opposed "Boxer" engine, air-cooled
Bore/stroke 90 x 70,6 mm
Cubic capacity 898 cm3
Max power 67 PS (49,3 kW) at 7000 rpm
Max torque 76 Nm at 5500 rpm
Compression ratio 9,5 : 1
Valves per cylinder 2
Valve control ohv, using push rod and rocker arm
Carburation system 2 slide carburettors, Dellorto PHM 38 AS-AD or 38 BS-BD
Engine lubrication wet sump

Power transmission

Clutch dry single plate, with diaphragm spring
Number of gears 5
Gear ratios 4,4 / 2,86 / 2,07 / 1,67 / 1,50 :1
Rear wheel ratio 1: 3,00 or 1 : 2,91
Bevel/crown wheel 11 / 33 teeth or 11 / 32 teeth

Electrical system

Alternator Bosch 12 V / 280 W
Ignition battery ignition
Starter Bosch 0,5 PS
Spark plugs Bosch W 200 T 30 / Beru 200/14/3 A / Champion N 7 Y

Suspension

Type of frame double-loop tubular frame with bolt-on rear section
Front suspension telescopic fork with hydraulic shock absorber
Rear suspension long swinging arm with adjustable strut
Spring travel 208 / 125 mm
Rims front 1,85 B 19
Rims rear 2,15 B 18
Tyres front 3,25 H 19
Tyres rear 4,00 H 18
Brakes front dual-disc brake 260 mm
Brakes rear Simplex drum brake 200 mm

Dimensions and weights

Length x width x height 2180 x 740 x 1210 mm
Wheel base 1465 mm
Ground clearance 165 mm
Tank capacity 24 l
Unladen weight, full tank 215 kg
Max permissible weight 398 kg
Fuel consumption 5,0 l / 100 km (at constant 90 km/h)
Acceleration 0 - 100 km/h 4,8 s
Top speed 200 km/h

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