Yamaha XT 660 X - 2006 Specifications and Reviews

The 2006 Yamaha XT 660 X is a versatile middleweight enduro designed for riders seeking adventure on and off-road. Its air-cooled single-cylinder engine delivers accessible power and torque, making it ideal for beginners and experienced adventurers alike. Known for reliability and practical ergonomics, the XT 660 X excels as a capable dual-sport for exploration.

2006
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General information

CategoryEnduro / offroad
Year2006
ModelYamaha XT 660 X

Engine and Transmission Specifications

ClutchWet, multiple disc
Transmission typefinal driveChain
Cooling systemLiquid
Lubrication systemDry sump
StarterElectric
IgnitionTCI
Fuel controlSOHC
Fuel systemInjection
Bore x stroke100.0 x 84.0 mm (3.9 x 3.3 inches)
Compression10.0:1
Torque58.40
Power47.33
Stroke4
Engine typeSingle cylinder
Capacity:660.00 ccm (40.27 cubic inches)
 
 

Physical measures and capacities

Wheelbase1,505 mm (59.3 inches)
Ground clearance210 mm (8.3 inches)
Overall width850 mm (33.5 inches)
Overall length2,240 mm (88.2 inches)
Overall height1,230 mm (48.4 inches)
Seat height865 mm (34.1 inches) If adjustable, lowest setting.
Dry weight165.0 kg (363.8 pounds)
 
 

Yamaha XT 660 X dimensions and frame

Rear brakes diameter245 mm (9.6 inches)
Rear brakesSingle disc
Front brakes diameter298 mm (11.7 inches)
Front brakesSingle disc
Rear tyre dimensions130/80-17
Front tyre dimensions90/90-21
Rear suspension travel160 mm (6.3 inches)
Rear suspensionMonocross with linkage
Front suspension travel225 mm (8.9 inches)
Front suspensionTelescopic fork
Frame typeFront suspension system

Speed and acceleration

Power/weight ratio0.2868 HP/kg

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
Fuel capacity15.00 litres (3.96 gallons)

Performance Profile & Rider Fit

47.3 hp
Peak Power
5.8s
0-60 mph

Best For

Track35%
City70%
Cornering75%
Daily Riding65%
Touring45%
Passenger35%

Rider Profile

Best ForSuits riders with at least some prior experience, as the tall seat height and single-cylinder torque delivery reward confident handling.
PurposeDesigned as a supermoto-styled machine for punchy, playful riding on twisty tarmac and light urban duty rather than outright speed or long-distance touring.
Rider FitThe 875mm seat height and 177kg dry weight demand reasonably long legs and moderate strength for stop-and-go maneuvering.
CharacterA lively, single-cylinder torque-driven bike that feels agile, upright, and eager to flick through corners with minimal fuss.
Not Ideal ForNot ideal for riders seeking high-speed highway cruising, plush two-up touring comfort, or serious off-road capability.

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

Rider Fit Visualizer

2006 Yamaha XT 660 X Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 865mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with tip-toe one foot on the 2006 Yamaha XT 660 X, with a cramped knee angle of around 75 degrees and a slightly forward 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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