Engineered by Piaggio for the scooter motorcycle segment, the 2005 Piaggio X9 Evolution 125 relies on a 124 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 20.1 HP (14.7 kW) at 10,000 rpm while maximum torque reaches 12 Nm (8.9 lb-ft) at 8,000 rpm, transferring power to the rear wheel through a automatic gearbox. With a specific output of 162.1 HP per liter and a 2,000 rpm working window between peak torque (8,000 rpm) and peak power (10,000 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the X9 Evolution 125 measures 179 kg (395 lbs) wet (curb), translating to a power-to-weight ratio of 0.11 HP/kg (8.91 kg per horsepower). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,500 mm (59.1 in) wheelbase engineered for balanced agility and highway composure. The 15.2-liter (4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Piaggio archive, this model family spans 3 indexed model years from 2005 to 2007, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
162.1 HP/L
Power-to-Weight
0.11 HP/kg (8.91 kg/HP)
Power Band Window
8,000–10,000 rpm
Standover Height
790 mm (31.1 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power20.1 HP (14.7 kW)) @ 10000 RPM
Torque12.0 Nm (1.2 kgf-m or 8.9 ft.lbs) @ 8000 RPM
Compression12.0:1
Bore x Stroke57.0 x 48.6 mm (2.2 x 1.9 inches)
IgnitionElectronic CDI
CoolingLiquid
Transmission
GearboxAutomatic
Clutch“Twist and Go” automatic dry centrifugal type
Chassis
Frame TypeDouble cradle, high strength steel tube
Front SuspensionTelescopic hydraulic fork, stanchions Ø 35 mm
Front Travel90 mm (3.5 inches)
Rear SuspensionTwin hydraulic shock absorbers with preload adjuster
Wheelbase1500 mm (59.1 inches)
Wheels & Brakes
Front Tyre120/70-14
Rear Tyre140/60-14
Front BrakesDouble disc
Front Brake Ø240 mm (9.4 inches)
Rear BrakesSingle disc
Rear Brake Ø240 mm (9.4 inches)
Dimensions & Weight
Dry Weight76.0 kg (167.6 pounds)
Weight incl.179.0 kg (394.6 pounds)
Power/Weight0.2646 HP/kg
Seat Height790 mm (31.1 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.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
