The Norton Commando 850 Roadster MKII motorcycle was introduced in 1975 and featured a four-stroke, parallel-twin-cylinder engine with pushrod 2 valves per cylinder. It had a capacity of 829 cc and a compression ratio of 8.5:1. The bike was air-cooled and used 2 Amal carbs for induction. The ignition was powered by a 120W Lucas alternator and it had both electric and kick starting options. The Norton Commando 850 had a maximum power output of 60 hp at 6200 rpm, with a transmission of 4 speeds and a metal diaphragm clutch. The final drive was through a chain. The frame was a twin downtube cradle with Isolastic engine mounts, while the suspension consisted of telescopic forks at the front and a swing arm with Girling coil springs at the rear. The front and rear brakes were single discs, and the tires were 4.10-19 at both front and rear. The bike’s wet weight was 233 kg, and the fuel capacity was 19 liters. It had an average fuel consumption of 5.3 L/100 km and a top speed of 185 km/h. Its standing 1/4 mile time was 14.4 seconds with a speed of 145 km/h or 90 mph. The Norton Commando 850 Roadster MKII was a popular motorcycle during its time and continues to enjoy a cult following among enthusiasts.
Technical specifications:
Make Model: Norton Commando 850 Roadster MKII
| Year | 1975 |
|---|---|
| Engine | Four stroke, parallel twin cylinder, push rod 2 valves per cylinder. |
| Capacity | 829 cc / 50.6 cu in |
| Bore x Stroke | 77 x 89 mm |
| Compression Ratio | 8.5:1 |
| Cooling System | Air cooled |
| Induction | 2 x ~A32 mm Amal concentric carburetors |
| Ignition | 120W Lucas alternator |
| Starting | Electric and kick |
| Max Power | 60 hp / 44.7 kW @ 6200 rpm |
| Clutch | Metal diaphragm clutch |
| Transmission | 4 Speed |
| Final Drive | Chain |
| Frame | Twin downtube cradle with Isolastic engine mounts |
| Front Suspension | Telescopic forks |
| Rear Suspension | Swing arm with Girling coil springs |
| Front Brakes | Single disc |
| Rear Brakes | Single disc |
| Front Tyre | 4.10-19 |
| Rear Tyre | 4.10-19 |
| Wet Weight | 233 kg / 514 lbs |
| Fuel Capacity | 19 Litres / 5.0 US gal |
| Average Fuel Consumption | 5.3 L/100 km / 18.7 kn/l / 44 US mpg |
| Standing 1/4 Mile | 14.4 sec / 145 km/h / 90 mph |
| Top Speed | 185 km/h / 115 mph |
