449cc liquid-cooled, DOHC, four-valve, four-stroke single
A lightweight forged piston reduces reciprocating weight
Triple piston rings and a 21mm 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
Lightweight high-performance titanium exhaust header contributes to low and mid-range throttle response
Electric starting facilitates quicker stall recovery and lowers rider fatigue
Large-volume
air box 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 wheel spin
Digital Fuel Injection (DFI)
32-bit digital fuel injection system with a 42mm 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 reduce rider fatigue
Transmission
The five-speed (one-down, four-up) manual transmission locates the reverse gear below first
Actuating the reverse-lock release lever when in first gear allows you 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 using 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
Monster Energy Edition
Special painted black aluminum frame
Special black wheels
Molded black Thermo-Plastic Olefin (TPO) bodywork provides ultra-high gloss appearance and is scratch-resistant
Special Kawasaki Monster Energy graphics rake lever also prevents the clutch lever from being actuated
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
Tapered Renthal Fatbar offers both strength and lightweight
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
Specifications
Engine: Liquid-cooled, four-stroke, DOHC, four-valve single
Displacement: 449cc
Bore x stroke: 96 x 62.1mm
Ignition: Digital AC-CDI
Transmission: Five-speed with reverse
Final drive: Two-wheel drive, chain
Frame: Aluminum double cradle, racing type
Suspension front / wheel travel: Dual A-arms, coil-over shocks / 8.5 in.
Suspension rear / wheel travel: Swingarm with piggyback reservoir shock, dual-rate spring / 10.0 in.
Front tire: AT21x7-10
Rear tire: AT20x10-9
Front brakes / rear brake: Dual 163mm discs with two-piston calipers / 200mm petal-type rotor with single-piston caliper