Yamaha XT660X - 2008 Specifications and Reviews

The 2008 Yamaha XT660X is a lightweight supermoto designed for versatile riders seeking an agile, manageable machine. Its 660cc single-cylinder engine delivers accessible power and torque, making it ideal for urban commuting and weekend road adventures. Known for its nimble handling and approachable performance, the XT660X appeals to both novice and experienced riders.

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General information

CategorySuper motard
Year2008
ModelYamaha XT660X
 
 

Engine and Transmission Specifications

ClutchWet, multiple-disc coil spring
Transmission type,final driveChain
Gearbox5-speed
Cooling systemLiquid
Lubrication systemDry sump
IgnitionTCI
Fuel controlSOHC
Fuel systemInjection
Bore x stroke100.0 x 84.0 mm (3.9 x 3.3 inches)
Compression10.0:1
Torque60.00 Nm (6.1 kgf-m or 44.3 ft.lbs) @ 6100
Power47.33
Engine typeSingle cylinder, four-stroke
Capacity:660.00 ccm (40.27 cubic inches)

Brakes, suspension, Frame and wheels

Rear brakes diameter245 mm (9.6 inches)
Rear brakesSingle disc
Front brakes diameter320 mm (12.6 inches)
Front brakesSingle disc
Rear tyre dimensions160/60-R17
Front tyre dimensions120/70-R17
Rear suspension travel120 mm (4.7 inches)
Front suspension travel130 mm (5.1 inches)
Frame typeSteel tube, diamond shaped

Physical measures and capacities

Fuel capacity15.00 litres (3.96 gallons)
Wheelbase1,490 mm (58.7 inches)
Ground clearance205 mm (8.1 inches)
Overall width860 mm (33.9 inches)
Overall length2,175 mm (85.6 inches)
Seat height875 mm (34.4 inches) If adjustable, lowest setting.
Power/weight ratio0.2674 HP/kg
Dry weight177.0 kg (390.2 pounds)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
StarterElectric

Performance Profile & Rider Fit

47.3 hp
Peak Power
5.5s
0-60 mph

Best For

Track60%
City70%
Cornering85%
Daily Riding60%
Touring40%
Passenger35%

Rider Profile

Best ForBest suited to riders with at least some prior experience, since the tall seat, supermoto-tuned chassis, and sharp handling reward confident, active riding.
PurposeBuilt as a road-focused supermoto, this bike is meant for flicking through tight city streets and attacking twisty backroads rather than long-distance cruising or serious off-road work.
Rider FitThe 865mm seat height and light 186kg weight favor taller or more athletic riders who can comfortably manage the bike at a stop and enjoy standing-up, aggressive body positioning.
CharacterIt suits a playful, corner-hungry rider who values sharp steering, sporty street handling, and a punchy single-cylinder engine over outright top speed or plush comfort.
Not Ideal ForIt is not a good match for riders seeking a relaxed touring companion, heavy passenger carrying capability, or a highly capable off-road adventure machine.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2008 Yamaha XT660X Rider Ergonomics Assessment

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Feet:

At 875mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with tip-toe one foot on the 2008 Yamaha XT660X, with a relaxed knee angle of around 140 degrees and a forward-leaning riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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