1973 BMW R90S Motorcycle Specs

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1973 BMW R90S
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ENGINE SPECS

Engine Type: 898 cc, air cooled, 2 – cylinders boxer, 4-stroke
Engine Bore and Stroke: 90 mm x 70.6 mm
Compression ratio 9,5:1
Valves ohv, using push rod and rocker arm , 2 valves/cylinder
Fuel system 2 slide carburettors, Dellorto PHM 38 AS-AD or 38 BS-BD
Ignition battery ignition
Horsepower: 67 hp (50 kW) @ 7000 rpm
Torque 76 Nm (56.1 ft. lbs) @ 5500 rpm
Lubrication system wet sump

Clutch dry single plate, with diaphragm spring
Transmission type: 5 speed
Gear Ratios: 1st 4.4, 2nd 2.86, 3th 2.07, 4th 1.67, 5th 1.5
Primary drive 3.00 or 2.91
Final Drive: Shaft, 11 / 33 or 11 / 32
Starting system Electronic


CHASSIS SPECS

Frame double-loop tubular frame with bolt-on rear section
Suspension – Front: telescopic fork with hydraulic shock absorber , 208 mm travel
Suspension – Rear: long swinging arm with adjustable strut , 125 mm travel


MISCELLANEOUS SPECS

Tire – Front: 3,00-21
Tire – Rear: 4,00-18
Brakes – Front: dual 260 mm discs with 2-piston calipers
Brakes – Rear: 200 mm drum


DIMENSIONS

Overall length 2180 mm (85.8 inches)
Overall width 740 mm (29.1 inches)
Overall height 1210 mm (47.6 inches)
Wheelbase 1465 mm (57.7 inches)
Ground clearance 165 mm (6.5 inches)
Fuel capacity – reserve 24 l (6.3 gallon US)
Dry weight 215 kg (474 pounds)


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