Built around ATK's enduro - offroad motorcycle platform, the 2008 ATK 450 MX utilizes a 449 cc (27.4 cu in) liquid-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 48 HP (35 kW) at 10,000 rpm, transferring power to the rear wheel through a 5-speed gearbox. With a specific output of 106.9 HP per liter, 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 450 MX measures 109.8 kg (242 lbs) dry, translating to a power-to-weight ratio of 0.44 HP/kg (2.29 kg per horsepower). Rider ergonomics and chassis geometry center around a 965 mm (38 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,486 mm (58.5 in) wheelbase engineered for balanced agility and highway composure.
Within MotoLibrary's ATK archive, this model family spans 2 indexed model years from 2007 to 2008, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
106.9 HP/L
Power-to-Weight
0.44 HP/kg (2.29 kg/HP)
Standover Height
965 mm (38 in)
Engine
Displacement449.0 ccm (27.40 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power48.0 HP (35.0 kW)) @ 10000 RPM
Compression12.3:1
Bore x Stroke95.0 x 63.4 mm (3.7 x 2.5 inches)
Fuel SystemInjection. EFI Fuel Injection
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
Ignition12v Battery w Constant Energy Inductive Coil
CoolingLiquid
Transmission
Gearbox5-speed
ClutchMagura Hydraulic
Chassis
Frame TypeAluminum Twin-Spar
Front Suspension46mm Ohlins 12” Travel
Front Travel305 mm (12.0 inches)
Rear SuspensionOhlins POS 12.6” Travel
Rear Travel320 mm (12.6 inches)
Wheelbase1486 mm (58.5 inches)
Ground Clearance361 mm (14.2 inches)
Wheels & Brakes
Front BrakesSingle disc. Dual piston, 240mm Rotor
Front Brake Ø240 mm (9.4 inches)
Rear BrakesSingle disc. Dual piston, 220mm Rotor
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Dry Weight109.8 kg (242.0 pounds)
Power/Weight0.4373 HP/kg
Seat Height965 mm (38.0 inches) If adjustable, lowest setting.
Other
StarterElectric
Notes
New for 2008 New Falicon Stroker Crankshaft New Aluminum Nikasil Cylinder New Bore and Stroke for Max Power New Fuel Injection Settings New Kickstand New Graphics New Improved Seat Riders Choice Options
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.
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.
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.
