Kawasaki KFX450R User Manual

SPECIFICATIONS

Engine Type 4-Stroke, Single, Liquid Cooled, DOHC, 4-Valve

Bore & Stroke

96.0 x 62.1 mm

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Compression Ratio	12.0:1
Fuel System	DFI with Keihin 42mm throttle body
Transmission/Drive System	5-Speed with Reverse

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Front Tire Size	AT21R x 7-10
Rear Tire Size	AT21R x 10-9

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Front Brake Type		Dual discs
Rear Brake Type		Petal disc
Front Suspension	Type Dual A-Arms, Two Shocks w/Fully Adjustable
	Preload and Compression & Rebound Damping
Rear Suspension Type		Swingarm, Progressive Link, Single Shock
		w/Fully Adjustable Preload, Highand

Low-Speed Compression, and Rebound Damping

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(Specifications subject to change without notice.)

* = Changes from previous model year..

Kawasaki provides a short cut to the race circuit with the all-new KFX450R. The KFX450R was designed with everything to

keep it ahead of the pack, whether it’s ridden on the track or trail. Its engine comes straight from the Championship-winning KX450F with the addition of digital fuel injection and a reverse gear to back out of tight situations. The aluminum frame is both lightweight and rigid, plus it’s designed for superb handling

and to allow the KFX450R to maximize traction

KFX450R

	without wasted wheelspin. Kawasaki made the			•		Dual overhead, asymmetrical high-acceleration
	KFX450R race-ready so that extensive, and					camshafts are treated with a soft-nitriding
	expensive, modifications are unnecessary to					surface treatment to reduce friction and provide
	put it ahead of the pack.					reliable operation at all rpm.
				•		Located on the exhaust camshaft, the Automatic
	Key Features:					Compression Release (KACR) allows for easy
	High-performance, 4-Stroke Engine Derived					starting.
		from the KX450F		•		Screw-type automatic cam chain adjuster
	Digital Fuel Injection					maintains precise valve control and requires no
	Reverse Gear					maintenance. The adjuster also eliminates the
						possibility of vibration resulting from a loose
	Aluminum Frame
						camchain.
				Liquid Cooling System
	High Performance 4-Stroke Engine			•		High-capacity Denso radiator features tightly
	•	Based on the World Supercross Championship				spaced cores and a special fin design for
		winning KX450F.				enhanced heat dispersion.
	• Designed to lower center of gravity, centralize			•		Radiator profile is greatly reduced.
		mass and inertia points which is particularly		•		Separate oil filter/water pump cover allows for
		important on big bore 4-stroke, single-cylinder				easy oil filter maintenance.
		engines.		Lightweight Exhaust System
	•	Connecting rod and crankshaft are case hard-
				•		Light weight titanium head pipe with heat shield
		ened to improve durability and rigidity. The big-
						improves exhaust efficiency over a greater rpm
		end bearing features caged needle bearings for
						than straight tubing.
		high rpm reliability.
				•		Muffler packing is thick and has long fibers to
	•	Aluminum cylinder with chrome composite
						extend intervals between muffler packing. The
		plating provides rapid heat transfer, superb
						silencer core bolt-on silencer provides easy
		wear resistance and optimum lubrication retention
						access for changing the packing.
		for increased performance and durability.
						Digital Fuel Injection
	•	Precision manufactured, lightweight, forged
				•		Using sensors for water temperature, air intake
		piston with a low friction coating on the skirt.
	•	Thin-walled crankcases reduce weight.				temperature and pressure, engine speed
						and throttle position, the fuel injection system
	•	Semi-dry sump lubrication system for quicker
						automatically meters the ideal amount of fuel for
		engine response. The majority of oil is stored in
						consistent power delivery.
		the transmission to keep excess oil away from
				•		Provides sharp engine response for instant
		the crankshaft and prevent power-robbing stirring
						acceleration when landing from jumps.
		loss. With only a shallow chamber to collect oil at
				•		Easier start-up provides an edge in competitions
		the bottom of the crankcase, where a scavenge
		pump moves it to the transmission, the crank				with dead-engine starts.
		is located as low as possible to help lower the		•		Extremely light throttle pull reduces rider fatigue.
		center of gravity.		Multi-Map Digital Ignition
	• Twin oil pumps ensure proper lubrication and oil			•		High speed 32-bit CPU provides precise engine
		scavenging for optimum performance.				management.
	• To eliminate external oil lines, oil passages are			•		Lost spark control smooths over-rev power by
		built into engine cases to reduce weight and				precisely cutting spark as the engine nears
		improve reliability.				redline. Spark gradually starts tapering off
	4-Valve Cylinder Head					approximately 1000 rpm before the rev limiter is
	•	Valves are coated with an oxidized membrane				reached so that power does not abruptly cut-out
		treatment to resist wear. 36mm intake and 31mm				when the rev limiter is activated, like conventional
		exhaust valves.				systems.
	• Dual, progressive, valve springs help ensure			•		Gear position sensor aids starting and provides
		reliable valve control and reduce cylinder head				precise spark control.
		height.