BMW R 90 S
| Production Year: | 1973, 1974, 1975, 1976 |  |
| Type: | air-cooled, four-stroke, two cylinder boxer, 2 valves per cylinder |
| engine specs | |
| Type | air-cooled, four-stroke, two cylinder boxer, 2 valves per cylinder |
| Displacement | 898 cm3 |
| Bore X Stroke | 3.5x2.8 in OR 89 mm |
| Compression Ratio | 9.5:1 |
| Horsepower | 67/7000 KW(hp)/RPM |
| Torque | 56/5500 lb-ft/RPM OR 76/5500 Nm/RPM |
| Fuel System | 2xDellOrto PHM 38 carburetors |
| transmission specs | |
| Gearbox | 5-speed, manual |
| Clutch | dry, single plate, diaphragm spring |
| Final Drive | shaft |
| chassis specs | |
| Frame | steel |
| Front Suspension | telescopic hydraulic fork |
| Rear Suspension | dual adjustable shocks |
| Front Brake | dual 260mm discs, 1-piston calipers |
| Rear Brake | 200mm drum |
| dimension specs | |
| Overall Length | 85.8 in OR 2179 mm |
| Overall Width | 29.1 in OR 739 mm |
| Seat Height | 32.2 in OR 818 mm |
| Ground Clearance | 6.5 in OR 165 mm |
| Weight | 474 lbs OR 215 kg |
| Fuel Capacity | 6.3 gallons OR 23.8 L |
| Wheelbase | 57.7 in OR 1466 mm |
| tyres specs | |
| Front | 3.25 - H19 |
| Rear | 4.00 - H18 |
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