BMW R 90 / 6

BMW R 90 / 6 Date 1973 - 1976

Number sold 21.097

Price 7.150,- 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 60 PS (44,1 kW) at 6500 rpm
Max torque 73 Nm at 5500 rpm
Compression ratio 9,0 : 1
Valves per cylinder 2
Valve control ohv, using push rod and rocker arm
Carburation system 2 constant depression carburettors Bing 64/32/11-12
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: 3,09 or 1 : 3,2
Bevel/crown wheel 11 / 34 teeth or 10 / 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 230/14/3 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 S 19
Tyres rear 4,00 S 18
Brakes front single disc brake 260 mm
Brakes rear Simplex drum brake 200 mm

Dimensions and weights

Length x width x height 2180 x 740 x 1080 mm
Wheel base 1465 mm
Ground clearance 165 mm
Tank capacity 18 l, optional 22 l tank at extra charge
Unladen weight, full tank 210 kg
Max permissible weight 398 kg
Fuel consumption 5,5 l / 100 km (at constant 90 km/h)
Acceleration 0 - 100 km/h 5,2 s
Top speed 188 km/h

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