Norton 1968 Commando MK 1 745 OHV 2 cyl 3602

Norton 1968 “Commando MK 1“ 745 OHV twin frame # 128934 engine # 20M3 /128934

The new Commando was launched in 1967 and used the preceding Atlas model’s 750cc engine and AMC gearbox. It was an instant hit with the motorcycling public and was voted MCM’s “Machine of the year” for five consecutive years. The most important new feature of the Commando was its vibration-beating “Isolastic” frame. The canted-forward engine retained the 73 mm x 89 mm bore and stroke of the Atlas engine. Compression ratio was raised to 8.9:1 and the engine breathed through two 30mm Amal Concentric carburettors and the power output increased to 58 bhp (43 kW) at 6,500 rpm. An alternator replaced the previous magneto and dynamo. Points for the coil ignition were mounted on a chain driven jackshaft at the rear of the engine where the magneto had previously been positioned. The transmission retained the pre-unit 4-speed Norton gearbox with a new diaphragm clutch and triplex primary drive. Although it was a little down on top speed compared to rivals such as BSA-Triumph’s 750cc triples and Honda’s CB750 four, the Commando more than made up for this minor deficiency with superior mid-range torque and steadier handling.
The American magazine Cycle World road-tested the Commando in September 1968, link:
Norton Commando | Cycle World | SEPTEMBER 1968
Production started in April, 1968 and the engine prefix of our machine, 20M3, shows this bike is a very early Commando. This type had an external rev counter drive and the contact points were placed at the former magneto position. It would become known as “MK I” or “Fastback” after other Marks and Models were introduced, and is by many enthusiasts considered as the most desirable Commando. Our machine has been excellently restored and comes with metal petrol tank (the original tank was made in fiberglass, but Norton soon stopped using these) and single Amal Concentric carb. Riders regularly changed the difficult-to-adjust double carbs for a more convenient single item, which hardly made any difference in engine performance. This very nice Commando comes with original Riders’ Handbook and spares list.