XT660X

2008 Yamaha XT660X Technical Analysis & Specification Breakdown

Positioned in Yamaha's super motard motorcycle lineup, the 2008 Yamaha XT660X relies on a 660 cc (40.3 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 47.3 HP (34.5 kW) at 12,000 rpm while maximum torque reaches 60 Nm (44.3 lb-ft) at 6,100 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 71.7 HP per liter and a 5,900 rpm working window between peak torque (6,100 rpm) and peak power (12,000 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 XT660X measures 177 kg (390 lbs) dry, translating to a power-to-weight ratio of 0.27 HP/kg (3.74 kg per horsepower). Rider ergonomics and chassis geometry center around a 875 mm (34.4 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,490 mm (58.7 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 7 indexed model years from 2008 to 2015, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.