BMW R 100 RS

R 100 RS Date 1976 - 1984

Number sold 33.648

Price 11.210,- DM

Engine

Type four-stroke, two-cylinder, horizontally-opposed "Boxer" engine, air-cooled
Bore/stroke 94 x 70,6 mm
Cubic capacity 980 cm3
Max power 70 PS (51 kW) at 7250 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 constant depression carburettors
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 (optional sport version 3,38/2,43/1,93 /1,67/1,50)
Rear wheel ratio 1 : 2,91 or 1 : 3,0
Bevel/crown wheel 11 / 32 teeth or 11 / 33 teeth

Electrical system

Alternator Bosch 12 V / 240 W
Ignition battery ignition, from 1980: contact-free electronic ignition (Bosch)
Starter Bosch 0,6 PS (from 1978: 0,7 kW)
Spark plugs Bosch W 225 T 30 / Beru 230/14/3 A / Champion N 6 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 200 / 125 mm
Rims front 1,85 B x 19
Rims rear 2,15 B x 18
Tyres front 3,25 H 19
Tyres rear 4,00 H 18
Brakes front single disc brake 260 mm
Brakes rear Simplex drum brake 200 mm 1978: Einscheiben 260 mm

Dimensions and weights

Length x width x height 2130 x 746 x 1300 mm (from 1978: length 2210 mm)
Wheel base 1465 mm
Ground clearance 165 mm
Tank capacity 24 l
Unladen weight, full tank 230 kg
Max permissible weight 398 kg
Fuel consumption 5,75 l / 100 km (at constant 90 km/h)
Acceleration 0 - 100 km/h 4,6 s
Top speed 200 km/h

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