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R 90 S

R 90 S
. Data sheet
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Production
Begin of Production 1973
End of Production 1976
Number Sold 17.465
Price 9.130,- DM
Engine
Motor Type four-stroke, two-cylinder, horizontally-opposed "Boxer" engine, air-cooled
Bore x Stroke 90 x 70,6 mm
Cubic Capacity 898 ccm
Max Power 67 hp (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 Selection dog-type gearbox (ratchet foot lever)
Gear Ratios 4.4 / 2.86 / 2.07 / 1.67 / 1.50 :1
Rear Wheel Ratio 1 : 3.00 or 1 : 2.91
Bevel / Crownwheel 11 / 33 teeth or 11 / 32 teeth
Electrical system
Ignition Bosch 12 V/280 W
Alternator Bosch 0.5 hp
Starter battery ignition
Spark Plugs Bosch W 200 T 30/Beru 200/14/3 A/Champion N 7 Y
Chassis
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 front/rear 208 / 125 mm
Rims front 1.85 B 20
Rims rear 2.15 B 19
Tyres front 3.25 H 20
Tyres rear 4.00 H 19
Brakes front dual-disc brake 260 mm dia
Brakes rear simplex drum brake 200 mm dia
Dimensions / Weights
Length x Width x Height 2180 x 740 x 1210 mm
Wheel Base 1465 mm
Tank Capacity 24 l
Unladen Weight, full Tank 215 kg
Max permissible Weight 398 kg
Ground Clearance 165 mm
Fuel Consumption 5,0 l/100 km (at constant 90 kph)
Top Speed 200 kph
Acceleration 0-100 kph 4,8 sec
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