Engineered by Kymco for the atv motorcycle segment, the 2021 Kymco Maxxer 450i utilizes a 443 cc (27 cu in) liquid-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 31.5 HP (23 kW) at 7,500 rpm while maximum torque reaches 33.8 Nm (24.9 lb-ft) at 6,500 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 71.1 HP per liter and a 1,000 rpm working window between peak torque (6,500 rpm) and peak power (7,500 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 Maxxer 450i measures 274 kg (604 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (8.7 kg per horsepower). Rider ergonomics and chassis geometry center around a 855 mm (33.7 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,224 mm (48.2 in) wheelbase engineered for quick, flickable steering geometry. 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 2010 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
71.1 HP/L
Power-to-Weight
0.11 HP/kg (8.7 kg/HP)
Power Band Window
6,500–7,500 rpm
Standover Height
855 mm (33.7 in)
Engine
Displacement443.0 ccm (27.03 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power31.5 HP (23.0 kW)) @ 7500 RPM
Torque33.8 Nm (3.4 kgf-m or 24.9 ft.lbs) @ 6500 RPM
Bore x Stroke89.0 x 71.2 mm (3.5 x 2.8 inches)
Fuel SystemInjection. EFI
Fuel ControlSingle Overhead Cams (SOHC)
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
DrivelineCVT Automatic H-L-N-R-P w/Engine Braking
Chassis
Frame TypePipe Under Bone
Front SuspensionIndependent Dual Aarm
Rear SuspensionIndependent Dual Aarm
Wheelbase1224 mm (48.2 inches)
Ground Clearance259 mm (10.2 inches)
Wheels & Brakes
Front Tyre23/8-12
Rear Tyre23/10-12
Front BrakesDouble disc
Rear BrakesSingle disc
WheelsAluminum Alloy Wheels
Dimensions & Weight
Dry Weight274.0 kg (604.0 pounds)
Power/Weight0.1150 HP/kg
Seat Height855 mm (33.7 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.
