Engineered by Aeon for the atv motorcycle segment, the 2021 Aeon Cobra 400 EFI features a 346 cc (21.1 cu in) liquid-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 20.1 HP (14.7 kW) at 6,000 rpm while maximum torque reaches 23 Nm (17 lb-ft) at 6,500 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 58.1 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the Cobra 400 EFI measures 243 kg (536 lbs) wet (curb), translating to a power-to-weight ratio of 0.08 HP/kg (12.09 kg per horsepower). Rider ergonomics and chassis geometry center around a 800 mm (31.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,290 mm (50.8 in) wheelbase engineered for quick, flickable steering geometry. The 9.3-liter (2.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
58.1 HP/L
Power-to-Weight
0.08 HP/kg (12.09 kg/HP)
Standover Height
800 mm (31.5 in)
Engine
Displacement346.0 ccm (21.11 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power20.1 HP (14.7 kW)) @ 6000 RPM
Torque23.0 Nm (2.3 kgf-m or 17.0 ft.lbs) @ 6500 RPM
Compression10.6:1
Bore x Stroke82.0 x 65.6 mm (3.2 x 2.6 inches)
Fuel SystemInjection
IgnitionECU
CoolingLiquid
Transmission
Final DriveChain (final drive)
Performance
Emission DetailsEuro 4
Chassis
Frame TypeTube
Front SuspensionDouble wishbone
Rear SuspensionSwingarm
Wheelbase1290 mm (50.8 inches)
Ground Clearance180 mm (7.1 inches)
Wheels & Brakes
Front Tyre21/7-10
Rear Tyre20/10-9
Front BrakesDouble disc
Front Brake Ø170 mm (6.7 inches)
Rear BrakesSingle disc
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Weight incl.243.0 kg (535.7 pounds)
Seat Height800 mm (31.5 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.
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.
