2021 Kymco AK 550 Technical Analysis & Specification Breakdown
Positioned in Kymco's scooter motorcycle lineup, the 2021 Kymco AK 550 pairs a 550.4 cc (33.6 cu in) liquid-cooled twin, four-stroke architecture with road-focused gearing. 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 5,500 rpm. With a specific output of 96.3 HP per liter and a 2,000 rpm working window between peak torque (5,500 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 550 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 4 indexed model years from 2020 to 2024, 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
5,500–7,500 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) @ 5500 RPM
Compression11.0:1
Bore x Stroke69.0 x 73.6 mm (2.7 x 2.9 inches)
Fuel SystemInjection
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionElectric
CoolingLiquid
Performance
Emission DetailsEuro 4
Chassis
Frame TypeUnderbone
Front SuspensionUpside down telescopic fork 41
Front Travel120 mm (4.7 inches)
Rear SuspensionHorizontal Trailing Arm Rear
Rear Travel48 mm (1.9 inches)
Wheelbase1580 mm (62.2 inches)
Wheels & Brakes
Front Tyre120/70-R15
Rear Tyre160/60-R15
Front BrakesDouble disc
Front Brake Ø270 mm (10.6 inches)
Rear BrakesSingle disc
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 OptionsBlack, grey
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.
