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R 90 S
   
. Data sheet
. Back to Models
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