Classic and Classy Motorcycles Ltd

Historical Context

The 1971 Triumph TR6R Tiger 650cc was one of the last of the classic Triumph single-carburetor 650 twins before the major design shift to the oil-in-frame models. Based on the same platform as the twin-carb Bonneville T120, the TR6R was seen as the more rider-friendly alternative—simpler to tune, easier to maintain, and more tractable in everyday use. Originally introduced in the 1950s, the TR6 evolved into a road-focused machine with a loyal following. The 1971 model stands at the end of the unit-construction frame era and is prized today for its traditional handling, aesthetics, and mechanical purity before Triumph’s changes in 1972 reshaped the platform.

Technical Specifications and Performance

• Year: 1971
• Make: Triumph
• Model: TR6R Tiger 650
• Engine Displacement: 649cc
• Engine Type: Air-cooled OHV parallel twin
• Compression Ratio: 9.0:1
• Carburetion: Single Amal concentric carburetor
• Ignition System: Points ignition
• Transmission Type: 4-speed manual
• Final Drive: Chain
• Cooling System: Air-cooled
• Fuel Capacity: Approx. 2.5 gallons
• Braking System: Drum front and rear
• Dry Weight: Approx. 385 lbs
• Top Speed: Around 100–105 mph

Technical Advancements

The 1971 TR6R featured several refinements carried over from the late '60s updates. The unit-construction engine, introduced in 1963, gave a stiffer chassis and reduced oil leaks. The bike used a single Amal Concentric carburetor, which was easier to tune than the twin-carb setup on the Bonneville, making the Tiger a favorite among long-distance riders and daily users. Suspension and brakes were traditional for the time, but the ride quality was praised for being balanced and predictable. The 1971 model retained the classic twin downtube frame and traditional Triumph styling—hallmarks that would change the following year.

Evolution of the Model

The TR6 line started in the 1950s as a high-performance roadster and evolved into a versatile model used for road riding, touring, and even competition. The TR6R was the "Roadster" version with a focus on street performance rather than the off-road TR6C. The 1971 model was the last to use the classic twin-loop frame before the controversial oil-in-frame chassis was introduced in 1972. As such, it’s considered by many collectors to be the last "true" traditional Triumph Tiger before styling and engineering took a more modern—if less beloved—direction.

Competitors in the Market

In 1971, the TR6R was up against the rising tide of Japanese motorcycles like the Honda CB450 and CB750, as well as homegrown rivals like the Norton Commando 750. While these competitors offered electric start, disc brakes, and higher top speeds, the Triumph still had the edge in terms of styling, simplicity, and rider engagement. The TR6R was also lighter and more nimble than many of its rivals, especially on twisty roads or rural lanes, which helped it maintain a loyal following.

Legacy and Appeal

As a barn find or restoration candidate, the 1971 Triumph TR6R Tiger 650 is a fantastic platform. It combines the timeless look of the classic British twin with the practicality of a single-carb setup. Riders appreciate its easier maintenance, strong low- and mid-range torque, and mechanical honesty. As the last of the pre-OIF Tigers, the 1971 model has strong collector appeal and is increasingly sought after for its rideability, looks, and historical importance in the Triumph timeline.