At the heart of the 2004 Yamaha XT 660 X Supermotard super motard motorcycle, Yamaha utilizes a 659 cc (40.2 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 5,250 rpm. With a specific output of 71.8 HP per liter and a 750 rpm working window between peak torque (5,250 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 Supermotard measures 173 kg (381 lbs) dry, translating to a power-to-weight ratio of 0.27 HP/kg (3.66 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 1,485 mm (58.5 in) wheelbase engineered for balanced agility and highway composure.
Specific Output
71.8 HP/L
Power-to-Weight
0.27 HP/kg (3.66 kg/HP)
Power Band Window
5,250–6,000 rpm
Standover Height
875 mm (34.4 in)
Engine
Displacement659.0 ccm (40.21 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsTwin, four-stroke
Power47.3 HP (34.5 kW)) @ 6000 RPM
Torque58.4 Nm (6.0 kgf-m or 43.1 ft.lbs) @ 5250 RPM
Compression10.0:1
Bore x Stroke100.0 x 84.0 mm (3.9 x 3.3 inches)
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingLiquid
Chassis
Front SuspensionTelescopic fork, diameter 43mm
Front Travel200 mm (7.9 inches)
Rear SuspensionMonocross with linkage
Rear Travel191 mm (7.5 inches)
Wheelbase1485 mm (58.5 inches)
Ground Clearance200 mm (7.9 inches)
Wheels & Brakes
Front Tyre120/70-17
Rear Tyre160/60-17
Front BrakesSingle disc
Front Brake Ø320 mm (12.6 inches)
Rear BrakesSingle disc
Rear Brake Ø245 mm (9.6 inches)
Dimensions & Weight
Dry Weight173.0 kg (381.4 pounds)
Power/Weight0.2736 HP/kg
Seat Height875 mm (34.4 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
