Classic and Classy Motorcycles Ltd

Historical Context
The 1978 Triumph 750 Bonneville T140E represents a crucial era in the storied legacy of Triumph motorcycles. Known for its distinctive style, performance, and handling, the T140E was part of the evolutionary Bonneville series, which began captivating riders in the late 1950s. By 1978, the Bonneville had undergone significant refinements, including the introduction of the Oil in Frame (OIF) design in the early '70s and updates to meet environmental standards without sacrificing its celebrated power and agility.

Technical Specifications and Performance

• Year: 1978

• Make: Triumph

• Model: 750 Bonneville OIF T140E

• Engine displacement: 750cc

• Engine type: Air-cooled, four-stroke, parallel-twin

• Compression ratio: 7.9:1

• Carburetion: Twin Amal carburetors

• Ignition system: Electronic ignition (upgraded from points)

• Cooling system: Air-cooled

• Fuel capacity: 3.8 US gallons

• Wheelbase: 58 inches

• Horsepower: 49 bhp @ 6200 rpm (approx.)

• Torque: 44 lb-ft @ 3700 rpm (approx.)

• Transmission type: 5-speed manual

• Frame type: Steel, Oil in Frame (OIF)

• Suspension system: Telescopic fork (front), Twin shock absorbers (rear)

• Braking system: Disc brake (front), Drum brake (rear)

• Dry Weight: 420 lbs (approx.)

• Top speed: Approximately 110 mph

• Acceleration: 0-60 mph in about 6 seconds

Technical Advancements
The T140E model introduced cleaner emissions through revised carburetion and exhaust systems, addressing environmental regulations while maintaining the Bonneville's signature performance. The transition to electronic ignition marked a significant improvement in reliability and maintenance, enhancing the riding experience.

Evolution of the Model
Triumph's Bonneville series evolved from its inception to become an icon of motorcycle design, with the T140E embodying the culmination of decades of engineering advancements. This model maintained the classic Bonneville aesthetic while incorporating modern features and improvements, making it a prime candidate for restoration and customization projects.

Cultural Impact
The Bonneville has long stood as a symbol of motorcycling heritage, with the T140E model continuing to inspire enthusiasts and custom builders. Its blend of classic lines with capable performance has made it a favorite for those looking to create a personalized riding experience, be it through restoration to original condition or transformation into a café racer, bobber, or other custom styles.

Racing Heritage
Although the T140E was designed primarily for the road, the Bonneville lineage includes a rich racing heritage. This model's reliable powertrain and adaptable chassis make it suitable for vintage racing and have endeared it to a community of riders who cherish Triumph's competitive spirit.

Competitors
In the late 1970s, the Triumph 750 Bonneville T140E faced competition from a growing array of Japanese motorcycles, which offered advanced technology and performance. Despite this, the T140E maintained its appeal through its unique character, British heritage, and the deep-seated loyalty of Triumph enthusiasts.