BMW R 100 S

BMW R 100 S Date 1976 - 1978

Number sold 11.762

Price 10.190,- 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 65 PS (48 kW) at 6600 rpm (1978: 70 PS/51 kW at 7250 rpm)
Max torque 75 Nm at 5500 rpm (1978: 77 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 Bing 94/40/103-104 od. 105-106
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
Starter Bosch 0,6 PS
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 19
Rims rear 2,15 B 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: Simplex drum brake 260 mm

Dimensions and weights

Length x width x height 2130 x 746 x 1210 mm
Wheel base 1465 mm
Ground clearance 165 mm
Tank capacity 24 l
Unladen weight, full tank 220 kg
Max permissible weight 398 kg
Fuel consumption 5,45 l / 100 km (70 PS: 5,75 l / 100 km) (at constant 90 km/h)
Acceleration 0 - 100 km/h 4,7 s (70 PS: 4,6 s)
Top speed 200 km/h

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