Thunderbird 350

2004 Enfield Thunderbird 350 Technical Analysis & Specification Breakdown

At the heart of the 2004 Enfield Thunderbird 350 naked motorcycle, Enfield features a 346 cc (21.1 cu in) air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 18 HP (13.1 kW) at 5,626 rpm while maximum torque reaches 27 Nm (19.9 lb-ft) at 2,875 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 52 HP per liter and a 2,751 rpm working window between peak torque (2,875 rpm) and peak power (5,626 rpm), the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.

On the scales, the Thunderbird 350 measures 163 kg (359 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (9.06 kg per horsepower). Rider ergonomics and chassis geometry center around a 760 mm (29.9 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,370 mm (53.9 in) wheelbase engineered for quick, flickable steering geometry.

Within MotoLibrary's Enfield archive, this model family spans 9 indexed model years from 2002 to 2019, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.