Standard Features


Lightweight, Sturdy and Race-ready

Whether you’re competing for a formal trophy or just for bragging rights, the KFX®450R is the ATV to get you there. Its lightweight aluminum frame and long lower front A-arm suspension are complemented by a powerful engine with digital fuel injection (DFI®) for optimized power delivery.


Model Year
KFX® 450R
Starting at MSRP


71.1 in.
41.9 in.
46.1 in.
392.5 lbs.
Ground Clearance
4.3 in.
49.4 in.
Seat Height
30.9 in.


4-stroke, DOHC, 4-valve single
449 cc
Bore x Stroke
96 x 62.1 mm
32-bit digital with 42 mm Keihin throttle body
Fuel Tank Capacity
2.6 gal.
Digital AC-CDI


5-speed with reverse
Drive System
2-wheel drive, chain


Front: Dual 163 mm discs with 2-piston calipers
Rear: 200 mm petal-type rotor with 1-piston caliper
Front: AT21 x 7-10
Rear: AT20 x 10-9


Dual removable 30W headlights, LED taillight, brake light


Front: Dual A-arms, coil-over shocks; 8.5 in. travel
Rear: Swingarm with piggy-back reservoir shock, dual-rate spring; 10 in. travel
Aluminum double cradle, racing type


Lime Green

Standard Features

449 cc Liquid-cooled, DOHC, Four-valve, Four-stroke single
 Lightweight forged piston reduces reciprocating weight  
 Triple piston rings and a 21 mm diameter piston pin help increase durability and reduce necessary maintenance  
 Lightweight titanium valves and aluminum valve spring retainers reduce reciprocating weight and boost high-rpm reliability  
 Asymmetrical high-acceleration cams yield high intake efficiency  
 Electric starting facilitates quicker stall recovery and lowers rider fatigue  
 Large-volume airbox contributes to both intake efficiency and sharp engine response. An air duct fashioned from polyethylene resists deformation caused by intake pulses and helps ensure stable engine performance.  
 Advanced engine tuning provides a broad torque curve and an optimized power delivery for quick acceleration without excessive wheelspin  
Digital Fuel Injection (DFI)
 32-bit digital fuel injection system with a 42 mm throttle body  
 System measures coolant temperature, air intake temperature, air intake pressure, engine speed and throttle position, then automatically delivers the ideal amount of fuel to optimize power delivery  
 Crisp engine response is especially advantageous for instant acceleration after landing from jumps  
 Promotes trouble-free starting — a great benefit in races with engine off starts  
 Fuel injection allows the use of a lighter throttle return spring, which reduces rider fatigue  
 5-speed (one-down, four-up) manual transmission locates reverse below first gear  
 Actuating the reverse-lock release lever when in first gear allows rider to shift "down" into reverse  
 Compact reverse-lock release lever can be activated with the right thumb, allowing the reverse gear to be engaged while still keeping the front brake lever depressed  
 The combined weight of the reverse gear system and the lightweight aluminum chassis is no heavier than a steel frame without reverse  
Aluminum Chassis
 Highly rigid frame contributes to the KFX’s excellent handling and traction  
 The aluminum frame’s high torsional rigidity enhances stability in corners and allows the suspension to be easily set up to suit course conditions  
 Designed for high corner speeds, the KFX450R sits low to the ground, helping to reduce roll tendencies  
 Mounting the battery and coolant tank ahead of the engine lowers the center of gravity, and helps weight the front wheels for increased traction  
 Single box-tube lower frame contains the front A-arm attachment points. This narrower design enables the use of longer lower A-arms.  
Advanced Suspension Design
 Dual-rate front springs deliver progressive suspension travel for excellent rough-terrain handling  
 Extra-long lower front A-arms minimize camber variations through the suspension stroke, maximize front wheel traction and boost stability  
 Rear shock features both low and high-speed compression adjustability and adjustable rebound damping  
 The curved lines and rounded edges of the cast aluminum rear swingarm help disperse stress, which along with its varied wall thicknesses equal a design that is both light and strong  
 The swingarm’s high torsional rigidity contributes to excellent rear wheel traction  
 The rear axle is tapered for less unsprung weight  
Front and Rear Disc Brakes
 Dual front hydraulic disc brakes offer strong, consistent stopping performance  
 Petal-type rear brake rotors reduce unsprung weight and help clean the brake pads for more efficient braking performance  
 Integrated rear parking brake is designed to be easily engaged and released while wearing gloves. When engaged, the parking brake lever also prevents the clutch lever from being actuated.  
Improved Water Resistance on Wiring Harness
 Resin-molded lead branch points  
 PVC cover over the connectors for regulator and TPS  
 Longer colgate tube for tail light leads  
Additional Features
 Two-tone seat features a smooth top surface for excellent rider mobility and slip-resistant sides for good grip when hanging off in corners  
 Seat, tank and side covers are shaped to allow excellent rider mobility and to provide support when hanging off in corners  
 Reinforced mounting on rear side of fuel tank  
 Tapered Renthal® Fatbar offers both strength and light weight  
 Handlebar mount is designed to accommodate other MX-type handlebars, enabling riders to select from numerous after-market styles  
 Specially designed rear wheels feature reinforcing plates for the rims. Located on the axle side of the rims, these plates reinforce the rims where strength is most needed while minimizing weight  
 Wide front bumper, can be gripped with two hands to push/pull the ATV  
 Two-piece "lapped" front and rear fenders can be replaced separately in the event they are damaged  
 Detachable front headlight assembly can easily be removed for racing  
 Optional kick-start system is available for MX-style (GNC) races where light weight is a priority  


Lime Green
*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.

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*Suggested Retail Price (SRP) excludes destination charge. Visit to view applicable destination charge amount.