BMW R 90 / 6
Number sold 21.097
Price 7.150,- DM
| Engine | |
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| Type | four-stroke, two-cylinder, horizontally-opposed "Boxer" engine, air-cooled |
| Bore/stroke | 90 x 70,6 mm |
| Cubic capacity | 898 cm3 |
| Max power | 60 PS (44,1 kW) at 6500 rpm |
| Max torque | 73 Nm at 5500 rpm |
| Compression ratio | 9,0 : 1 |
| Valves per cylinder | 2 |
| Valve control | ohv, using push rod and rocker arm |
| Carburation system | 2 constant depression carburettors Bing 64/32/11-12 |
| 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 ratios | 4,4 / 2,86 / 2,07 / 1,67 / 1,50 :1 |
| Rear wheel ratio | 1: 3,09 or 1 : 3,2 |
| Bevel/crown wheel | 11 / 34 teeth or 10 / 32 teeth |
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| Electrical system | |
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| Alternator | Bosch 12 V / 280 W |
| Ignition | battery ignition |
| Starter | Bosch 0,5 PS |
| Spark plugs | Bosch W 200 T 30 / Beru 230/14/3 A / Champion N 7 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 | 208 / 125 mm |
| Rims front | 1,85 B 19 |
| Rims rear | 2,15 B 18 |
| Tyres front | 3,25 S 19 |
| Tyres rear | 4,00 S 18 |
| Brakes front | single disc brake Ø 260 mm |
| Brakes rear | Simplex drum brake Ø 200 mm |
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| Dimensions and weights | |
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| Length x width x height | 2180 x 740 x 1080 mm |
| Wheel base | 1465 mm |
| Ground clearance | 165 mm |
| Tank capacity | 18 l, optional 22 l tank at extra charge |
| Unladen weight, full tank | 210 kg |
| Max permissible weight | 398 kg |
| Fuel consumption | 5,5 l / 100 km (at constant 90 km/h) |
| Acceleration | 0 - 100 km/h 5,2 s |
| Top speed | 188 km/h |
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