2025 Kymco AK 550i Technical Analysis & Specification Breakdown
Built around Kymco's scooter motorcycle platform, the 2025 Kymco AK 550i relies on a 550.4 cc (33.6 cu in) liquid-cooled twin, four-stroke powerplant. In factory specification, peak output is rated at 53 HP (38.7 kW) at 7,500 rpm while maximum torque reaches 55.1 Nm (40.6 lb-ft) at 5,750 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 96.3 HP per liter and a 1,750 rpm working window between peak torque (5,750 rpm) and peak power (7,500 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the AK 550i measures 226 kg (498 lbs) wet (curb), translating to a power-to-weight ratio of 0.23 HP/kg (4.26 kg per horsepower). Rider ergonomics and chassis geometry center around a 785 mm (30.9 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,580 mm (62.2 in) wheelbase engineered for planted straight-line stability. The 15-liter (4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kymco archive, this model family spans 2 indexed model years from 2023 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
96.3 HP/L
Power-to-Weight
0.23 HP/kg (4.26 kg/HP)
Power Band Window
5,750–7,500 rpm
Standover Height
785 mm (30.9 in)
Engine
Displacement550.4 ccm (33.59 cubic inches)
Engine TypeTwin, four-stroke
Power53.0 HP (38.7 kW)) @ 7500 RPM
Torque55.1 Nm (5.6 kgf-m or 40.6 ft.lbs) @ 5750 RPM
Compression11.0:1
Bore x Stroke69.0 x 73.6 mm (2.7 x 2.9 inches)
Valves/Cylinder4
Fuel SystemInjection
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionElectric
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
DrivelineCVT
Chassis
Frame TypeUnderbone
Front Suspension41mm Inverted Fork
Front Travel120 mm (4.7 inches)
Rear SuspensionHorizontal Trailing Arm
Rear Travel48 mm (1.9 inches)
Wheelbase1580 mm (62.2 inches)
Wheels & Brakes
Front Tyre120/70-R15
Rear Tyre160/60-R15
Front BrakesDouble disc. ABS
Front Brake Ø270 mm (10.6 inches)
Rear BrakesSingle disc. ABS
Rear Brake Ø260 mm (10.2 inches)
WheelsAluminium alloy
Dimensions & Weight
Dry Weight210.0 kg (462.9 pounds)
Weight incl.226.0 kg (498.2 pounds)
Power/Weight0.2524 HP/kg
Seat Height785 mm (30.9 inches) If adjustable, lowest setting.
Overall Height1400 mm (55.1 inches)
Overall Length2165 mm (85.2 inches)
Overall Width795 mm (31.3 inches)
Fuel Capacity15.00 litres (3.96 US gallons)
Oil Capacity3.00 litres (3.17 US quarts)
Other
StarterElectric
Color OptionsMatte Metallic Silver, Deep Blue.
LightLED lights
Carrying CapacityUnderseat storage
Warranty2 Year Limited Factory Warranty (Extended Warranty Packages Available)
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.
