XT660X

2009 Yamaha XT660X Technical Analysis & Specification Breakdown

Built around Yamaha's super motard motorcycle platform, the 2009 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) while maximum torque reaches 60 Nm (44.3 lb-ft), transferring power to the rear wheel through a 5-speed gearbox. With a specific output of 71.7 HP per liter, 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 189 kg (417 lbs) wet (curb), translating to a power-to-weight ratio of 0.25 HP/kg (4 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.