XT 660 X

2006 Yamaha XT 660 X Technical Analysis & Specification Breakdown

At the heart of the 2006 Yamaha XT 660 X enduro - offroad motorcycle, Yamaha utilizes a 660 cc (40.3 cu in) liquid-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 47.3 HP (34.5 kW) at 6,000 rpm while maximum torque reaches 58.4 Nm (43.1 lb-ft) at 5,950 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 71.7 HP per liter and a 50 rpm working window between peak torque (5,950 rpm) and peak power (6,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the XT 660 X measures 165 kg (364 lbs) dry, translating to a power-to-weight ratio of 0.29 HP/kg (3.49 kg per horsepower). Rider ergonomics and chassis geometry center around a 865 mm (34.1 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,505 mm (59.3 in) wheelbase engineered for balanced agility and highway composure. The 15-liter (4 US gal) fuel tank supports practical everyday commuting and weekend road stints.

Within MotoLibrary's Yamaha archive, this model family spans 2 indexed model years from 2006 to 2007, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.