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BMW R90S Specifications

 

 

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Start of Production

1973

BMW R90S

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End of Production

1976

Numbers Produced

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 (3.54 x 2.77 in)

Displacement

898 cc

Max Power

67 hp (49.3 KW) at 7,000 rpm

Max Torque

76 Nm / 56 ft lb at 5,500 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 Lubricating System

Wet sump

Power Transmission

 

Clutch

Dry single plate, with diaphragm spring

Number of Gears

5

Gear Selection

Dog type gearbox (ratchet foot lever)

Gearbox Ratios

4.4 / 2.86 / 2.07 / 1.67 / 1.50 (optional sport version: 3.38 / 2.43 / 1.93 / 1.67 / 1.50 : 1

Rear Wheel Ratio

1: 3.00 or 1 : 2.91

Bevel/Crownwheel

11 / 33  or 11 / 32 teeth

Electrical System

 

Ignition System

Battery ignition

Alternator

Bosch 12 V/280 W

Starter

Bosch 0.5 hp

Spark Plugs

Bosch W 200 T 30 / Beru 200/14/3 A / Champion N7Y

Chassis

 

Type of Frame

Double loop tubular frame with bolt on rear section

Front wheel suspension

Telescopic fork with hydraulic shock absorber

Rear wheel suspension

Long swinging arm with adjustable strut

Spring Travel Front/Rear

208 / 125 mm (8.18 x 4.92 in)

Wheel Rims, Front

1.85 B 19

Wheel 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 / 10.23 in diameter. ATE 1 piston caliper

Brakes, Rear

Simplex drum brake 200 mm / 7.87 in diameter

Dimensions/Weights

 

Length x Width x Height

2180 x 740 x 1210 mm (85.82 x 29.13 x 47.63 in)

Wheel Base

1465 mm / 57.67 in

Fuel Tank Capacity

24 litres / 5.27 gal / 6.34 gal US

Unladen Weight with Full Tank

215 Kg / 473 lb

Max. Permissible Weight

398 Kg / 876 lb

Ground Clearance

165 mm / 6.49 in

Seat Height (Unladen)

820 mm (32.2 inches)

Fuel Consumption

5.0 litres 100 Km (at constant 90 Kph) / 56 mpg / 47 mpg US

Top Speed

200 Kph / 124 mph

Acceleration 0 - 100 Kph / 62 mph

4.8 seconds

 

Member of BM Riders Club, The BMW Club, BMF, BMWMOA, The Airheads and The Poverty Riders

Check out my other sites at: www.bmridersclub.com & www.boxerman.co.uk & www.bmw-club.org.uk/~midland & www.bmw-club.org.uk/~archives

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