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Key Features:
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- Thebikethat started the four-stroke revolution benefits fromchassisrefinements that ensure the five-titanium-valved YZ450F remainsat 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.
- Readyto race straight out of the cratewith aProTaper? aluminum handlebar inadjustable 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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- Toptripleclamp has two sets of mounting holes, providing 4 handlebarpositions tosuit a wide variety of riders: standard, 10mm back, or10mm or 20mmforward.
- 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.
- Newrearwheel hub is lighter and designed for the larger 25mm diameteraxle (upfrom 22mm), helping to achieve the overall rigidity balance ofrearsuspension components.
- New clutchlever is shorter, stronger,and lighter, with a lever position adjusterto accommodate differentriders. 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.
- 39mmKeihinFCR flat-slide carburetor with throttle position sensor (TPS)and leakjet delivers precise fuel/air mixture and instant throttleresponse.
- Lightweighttitanium valves andload-reduced springs minimize reciprocating mass forfast-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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- Extensivelytestedaluminum frame uses a mix of alloy castings, forgings andextrusions toproduce a tuned-flex frame that makes the YZ thefinest-handlingmotocross 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 reducesfriction for fantasticcompliance and great handling.
- Moreweight savings come via two-piece (part aluminum,part plastic) engineprotector 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-bubblefrontmaster cylinder; wave-style rotors reduce unsprung weight anddeliverstrong 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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