BMW R90/6 1975 |
 |
| Engine | |||
| Configuration | Horizontally opposed air-cooled twin, pushrod operated valves, 2 per cylinder | Lubrication | Gear driven pump |
| Bore & Stroke | 90 x 70.6 mm | Ignition | Kettering |
| Capacity | 898 cc | Charging system | 12v 280w alternator |
| Compression Ratio | 9.0 : 1 | Starter | Electric starter 0.5 hp |
| Maximum Power | 60 DIN hp at 6500 rpm | Transmission | Gear driven primary drive, 3.09:1 bevel final drive (optional 3.20:1) |
| Maximum Torque | 52.7 ft/lb (7.3 mkg) at 5500 rpm | Gearbox | 1st 4.40: 1
2nd 2.86:1 3rd 2.07:1 4th 1.67:1 5th 1.50:1 |
| Fuel | Bing CV type V64, 32mm
Micronic air filter |
Clutch | Cable operated single plate dry clutch |
| Chassis | |||
| Frame | Steel main and bolt-on subframe | Wheels | 1.85 x 19 front
2.15 x 18 rear Spoked alloy rims |
| Dimensions | Weight: 210 kg wet
Wheelbase: 1465 mm Length: 2180 mm Seat Height: 810 mm |
Tyres | 3.25 H 19 front
4.00 H 18 rear |
| Front Suspension | Hydraulic telescopic | Brakes | Front: 260 mm stainless undrilled disc with floating single piston
caliper
Rear: 200 x 30 mm drum |
| Rear suspension | Boge dual dampers, springs adjustable for pre-load | Fuel Capacity | 18 Litres (4 Imperial gallons)
including 2.5l reserve Optional 22l tank available |
Performance
Top Speed
Upright: 178 kph (110 mph)
Prone: 188 kph (116 mph)
Fuel Economy
55.7 mpg (Imp.) at 68 mph
Acceleration
Standing 400m: 13.7 sec
Standing 1000m: 26.1 sec
BMW R90/6
The 1975 BMW R90/6
Castrol 6 Hour winner
