Nortom Commando 850 (1975)

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

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