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Engine Liquid-cooled, four-stroke single, DOHC, four valves per cylinder
Displacement 449cc
Bore x stroke 96 x 62.1mm
Fuel Injection 32-bit digital, with 42mm Keihin throttle body
Starting Electric
Transmission Five-speed with reverse
Final drive Two-wheel drive, chain
Frame type Aluminum double cradle, racing type
Front suspension / wheel travel Dual A-arms, coil-over shocks / 8.5 in
Rear suspension / wheel travel Swingarm with piggy-back reservoir shock, dual-rate spring / 10.0 in
Front tires AT21x7-10
Rear tires AT20x10-9
Front brakes Dual 163mm discs with two-piston calipers
Rear brake 200mm petal-type rotor with single-piston caliper
Overall length 71.1 in
Overall width 46.0 in
Overall height 41.9 in
Seat height 30.9 in
Wheelbase 49.4 in
Ground clearance 4.3 in
Lighting Dual removable headlights
Dry weight 364 lb
Fuel capacity 2.6 gal
Footpegs Sport-style serrated
Color choices Lime Green / Super Black, Bright White / Super Black, Super Black

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A machine’s racing performance is often limited by the performance of its frame. And since swapping frames is no easy task, the KFX450R comes equipped with a high-performance frame right from the start.

The KFX450R is the first ATV in its class to offer a completely aluminum chassis: frame, sub-frame and swingarm are all formed from lightweight aluminum. But more than for its weight saving potential, aluminum was chosen for its highly rigid properties.

The highly rigid aluminum frame contributes to the KFX’s excellent rough-road handling and traction. The frame’s high rigidity (especially its torsional rigidity) makes the KFX extremely stable in corners and allows the suspension to be easily set up to suit course conditions.
KFX450R Frame KFX450R ATV Narrow Frame
The highly rigid aluminum frame contributes to the KFX’s excellent rough-road handling and traction.

The lower part of the frame consists of a narrow single box-tube to which the front suspension’s lower A-arms are mounted.

KFX450R ATV Renthal HandleBars KFX450R ATV Swingarm
Renthal FAT-BAR is standard equipment. Tapered, the Renthal bar offers both strength and light weight.

Wall thickness is different for each surface, resulting in a design that is both light and strong.


KFX450R’s narrow frame tubes allow longer A-arms reduces unwanted camber changes.

The shorter A-arms of a dual tube frame canott control camber as well as the KFX450R.

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Compared to steel frames with similar rigidity, the aluminum frame offers roughly 20% in weight savings.
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Designed for high corner speeds, the KFX is set low to the ground, helping to suppress any tendency to roll.
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Mounting the battery low, in front of the engine contributes to the low centre of gravity, and weights the front wheels for increased traction when cornering.
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The lower part of the frame consists of a narrow single box-tube to which the front suspension’s lower A-arms are mounted.
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This design enables the length of the A-arms to be maximized. Longer arms minimize camber change as the suspension tracks over ruts and bumps and allow the use of long-stroke suspension for superior road holding performance.
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The front suspension features reservoir shocks with dual-rate springs. Even when the machine is unloaded, the shocks are considerably compressed, which means that there is plenty of down travel available to keep the front wheels in constant contact with ground even when the ground drops away suddenly.
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Thanks to the narrow frame design the length of the front suspension’s lower A-arms are maximized, offering excellent road-handling performance on both enduro-style GNCC courses as well as on MX-style GNC tracks.
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The extra long lower A-arms minimize camber variation through the suspension stroke. Keeping camber as consistent as possible helps maximize front wheel traction and contributes to stable handling performance.
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KFX450R’s narrow frame tubes allow longer A-arms reduces unwanted camber changes.
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The shorter A-arms of a dual tube frame canott control camber as well as the KFX450R.
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A Renthal FAT-BAR is standard equipment. Tapered, the Renthal bar offers both strength and light weight.
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The handlebar mount, positioned high enough to use the Renthal bar, can easily accommodate other MX handlebars, enabling riders to select from among numerous after-market parts according to personal preference.
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A balance of looks and strength, the cast aluminum swingarm is comprised almost entirely of stress-dispersing curved lines and rounded edges. The swingarm’s high torsional rigidity contributes to excellent rear wheel traction and road holding. Wall thickness is different for each surface, resulting in a design that is both light and strong.
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Reservoir rear shock offers dual compression adjustability (high-speed and low-speed damping can be tuned separately) as well as rebound damping adjustability. Taking into account the chassis’ low centre of gravity, rear suspension settings offer superb road holding and traction. (Photo 5)
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The rear axle is tapered for reduced unsprung weight.
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Specially designed aluminum rear wheels feature rims with reinforcing plates. Located on the inner (axle) side of the rims, these plates reinforce the rims where strength is most needed (for landing jumps, etc) while minimizing weight.
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The KFX450R features a petal brake at the rear. In addition to helping reduce unsprung weight, the wave shapes of the petal disc helps clean the brake pads for more efficient braking performance.
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The parking brake, which activates the rear brake, was designed to be easily engaged and released even while still wearing gloves. When engaged, the parking brake lever prevents the clutch lever from being actuated.
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Front 163 mm drilled disc brakes with twin piston calipers provide hard stopping power.
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In the event of getting stuck, the front bumper, wide enough to be gripped with two hands, provides a handy spot to push and/or pull the ATV.
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Two-piece construction of the front and rear lapped fenders means they can be replaced separately in the event they are damaged.
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Tire tread patterns were specifically selected to offer high traction for acceleration as well as excellent control characteristics when sliding the wheels while cornering.
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The front headlight assemblies can easily be removed to reduce weight when racing in MX-style (GNC) events.
 
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