Classic and Classy Motorcycles Ltd

Historical Context

The 1973 Norton Commando Interstate 750cc represented one of the final and most refined versions of Norton’s legendary Commando line. Introduced in 1968, the Commando quickly earned a reputation for blending British charm with genuine performance. By 1973, the Interstate variant had been introduced to cater to long-distance riders, featuring a larger fuel tank and more touring-friendly ergonomics. The Commando range was already a standout for its innovative “Isolastic” frame system, which dramatically reduced engine vibration. In an era dominated by the rise of powerful Japanese machines, Norton’s 750 still held its own thanks to excellent handling, torque-rich delivery, and character in spades.

Technical Specifications and Performance

• Year: 1973
• Make: Norton
• Model: Commando Interstate 750
• Engine Displacement: 745cc
• Engine Type: Air-cooled OHV parallel twin
• Compression Ratio: 8.9:1
• Carburetion: Twin Amal concentric carburetors
• Ignition System: Points ignition (some fitted with aftermarket electronic systems)
• Transmission Type: 4-speed manual
• Final Drive: Chain
• Cooling System: Air-cooled
• Fuel Capacity: Approx. 5.5 gallons (Interstate tank)
• Braking System: Front disc, rear drum
• Dry Weight: Approx. 440 lbs
• Top Speed: Around 115 mph

Technical Advancements

The 1973 Commando Interstate showcased Norton’s continued effort to modernize its platform without losing its classic DNA. The “Isolastic” frame system, first introduced in earlier models, remained a key feature—allowing a solid-mounted engine to float in rubber mounts, dramatically reducing the notorious vibration common in British twins. The Interstate model featured a large touring tank for increased range, improved seat comfort, and subtle revisions to the frame and suspension. This model year also saw the adoption of a front disc brake, further improving stopping power and bringing the Commando closer in line with international competition.

Evolution of the Model

The Commando started life as a 750 and later grew to 850cc in the mid-1970s. The 1973 Interstate 750 sits at the crossroads between early raw performance and later refinement. It retained the 750’s rev-happy character while offering better long-distance usability than earlier Roadster variants. The Interstate models were among the most touring-oriented Commandos, appealing to riders who wanted comfort without sacrificing classic British performance. The styling was unmistakable: elegant, muscular, and very much of its time.

Competitors in the Market

By 1973, the Norton Commando was up against some serious international rivals—Honda’s CB750 Four, BMW’s R75/5, and the Triumph Trident. While the CB750 offered electric start and greater reliability, the Commando struck back with better handling, a more soulful exhaust note, and classic British aesthetics. The BMW was smoother and better built but lacked the character and edge that defined the Norton. Among purists and performance riders, the Commando was still very much a contender.

Legacy and Appeal

The 1973 Norton Commando Interstate 750cc holds a special place in British motorcycle history. As a barn find or restoration project, it offers high reward for those willing to put in the effort. It combines the raw appeal of a classic twin with the innovations that kept Norton in the game longer than most. With parts availability, strong club support, and rising collectibility, the Commando remains a favourite among classic riders and collectors alike. The Interstate variant in particular offers a practical edge—ideal for real-world riding or classic touring.