This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1974 Norton Commando 850 was acquired by the seller in 2007 from the previous long-term owner, who had the bike since 1993. The seller refreshed the bike with assistance from Norton specialist, and former Athens Georgia Norton Dealer, Ron Small, including conversion to a single Mikuni carburetor, Mark.III isolastics, and cosmetic updates. The bike is finished in a custom black and silver scheme, and is fitted with electronic ignition, low-rise handlebars with bar-end mirrors, and an exhaust system with reverse-cone mufflers. This Norton is offered with records and a clean Georgia title in the seller’s name.
The bike is finished in a custom black and silver scheme with pinstripes and factory-style lettering on the tank and side panels. The suspension has been modified with isolastic components from a Mk.III Commando. 19″ wheels are equipped front and rear, and braking is handled by a single front disc and a rear drum. The seller notes that the tires are older and should be replaced.
The fuel tank has been cleaned and internally coated, and features silver paintwork in the knee cutouts. Close-up photos are provided of the trim and finish in the gallery below.
Low-rise handlebars are fitted in place of the factory items. Instrumentation includes a 150-mph speedometer, a 9k-rpm tachometer with a 7k-rpm redline, and a trio of warning lights mounted to the headlight housing. The seller notes that both gauges twitch when in use. Approximately 33,700 miles are shown on the 5-digit odometer, 2,500 of which were added by the seller.
Power is provided by an 850cc parallel twin, which is equipped with electronic ignition and was converted from dual Amal carburetors to a single Mikuni by former Norton specialist Ron Small. Power is sent to the rear wheel via a 4-speed transmission with chain drive. The seller has recently redone the exhaust port threads, and replaced the exhaust pipes and mufflers.