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Key Features:
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- Thebike that started the four-stroke revolution benefits from chassisrefinements that ensure the five-titanium-valved YZ450F remains at thehead of the open-class pack.
- Subtle modifications to the suspension mean light, precise, confident handling at any speed.
- Head and exhaust design delivers strongerlow- to midrange power without sacrificingtop end power.
- Ready to race straight out of the cratewith aProTaper? aluminum handlebar in adjustable clamps, titanium shock spring, gripper seat, Excel rims, etc.
- Five-speed gearbox provides maximum flexibilityand the right gear for a wide range ofriding environments.
- Dry sump lubrication system circulates more oil for the best durability in motocross.
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New for 2009:
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- Toptriple clamp has two sets of mounting holes, providing 4 handlebarpositions to suit a wide variety of riders: standard, 10mm back, or10mm or 20mm forward.
- Newly designed swingarm is lighter and helps to achieve excellentrigidity balance for superb cornering and rear wheel traction.
- Lightweight suspension linkage is redesigned to match the new swingarm.
- Newrear wheel hub is lighter and designed for the larger 25mm diameteraxle (up from 22mm), helping to achieve the overall rigidity balance ofrear suspension components.
- New clutchlever is shorter, stronger, and lighter, with a lever position adjusterto accommodate different riders. Quick adjuster makes maintenance easy.
- Front brake hose clamp is now aluminum, greatly reducing its weight.
- New seat cover has great grip and more durability, and its easy to clean.
- Premium drive chain has gold colored plates for outstanding looks.
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Engine:
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- 449cc, five-valve, DOHC, liquid-cooled engine is super-powerful yet tractable.
- 39mmKeihin FCR flat-slide carburetor with throttle position sensor (TPS)and leak jet delivers precise fuel/air mixture and instant throttleresponse.
- Lightweight titanium valves andload-reduced springs minimize reciprocating mass for fast-revving,hard-hitting power delivery across the rev range.
- Primary kickstarting with automatic decompression andconvenient, handlebar-mounted hot start lever ensureseasy restarts.
- Large-capacity radiator is reinforced for greater strength.
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Chassis/Suspension:
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- Extensivelytested aluminum frame uses a mix of alloy castings, forgings andextrusions to produce a tuned-flex frame that makes the YZ thefinest-handling motocross bike ever.
- Speed-Sensitive System 48mm KYB? fork damping force is controlledby piston speed: provides a smoother, more precise ride.
- Titanium-sprung, four-way adjustable rear shock withKashima-coated internals reduces friction for fantasticcompliance and great handling.
- More weight savings come via two-piece (part aluminum,part plastic) engine protector plates and thin-walled engine guard construction.
- Removable aluminum rear subframe constructed ofsquare-section tubing for light weight and easy maintenance.
- Lightweight front-wheel hub for reduced unsprung weight and increased durability.
- Lightweightfront- and rear-brake calipers with aluminum pistons and anti-bubblefront master cylinder; wave-style rotors reduce unsprung weight anddeliver strong stopping power.
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Additional Features:
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- Wide (55mm) footpegs provide excellent boot traction and rider comfort.
- ProTaper? aluminum handlebar for strength and performance.
- Works-style clutch lever features oversize barrel adjuster for easy, on-the-fly adjustability of lever/cable play.
- Repackable exhaust silencer.
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