BMW R 100 S
Number sold 11.762
Price 10.190,- DM
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| 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 |
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| Power transmission | |
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| 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 |
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| Electrical system | |
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| 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 |
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| Suspension | |
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| 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 Ø 260 mm |
| Brakes rear | Simplex drum brake Ø 200 mm 1978: Simplex drum brake Ø 260 mm |
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| Dimensions and weights | |
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| 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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