The most powerful, most flickable 450 ever.

yamaha-yz450f

Specifications
  • Make: Array
  • Model: yamaha-yz450f

2008 Yamaha YZ450F

Specifications
  • Engine/Motor: liquid-cooled DOHC 4-stroke; 5 titanium valves
  • Transmission: 5-speed
  • [do not use] Vehicle Model: Array

The bike that started the four-stroke revolution keeps moving forward with chassis and engine refinements that ensure the five-titanium-valved YZ450F remains at the head of the open-class pack.


Features


Key Features:


The bike that started the four-stroke revolution benefits from chassis and engine refinements that ensure the five-titanium-valved YZ450F remains at the head of the open-class pack.

Subtle modifications to the aluminum frame and suspension mean light, precise, confident handling at any speed.

New head and exhaust design delivers stronger low- to midrange power without sacrificing top end power.

Ready to race straight out of the crate—with a ProTaper aluminum handlebar in adjustable clamps, titanium shock spring, gripper seat, Excel rims, etc.

Five-speed gearbox provides maximum flexibility and the right gear for a wide range of riding environments.


New for 2008:


Revised intake port shapes, and revised intake and exhaust cam profiles increase combustion efficiency for improved torque and throttle response in the low- to mid-rpm range.

Micron-level adjustment of piston external diameter minimizes piston-to-cylinder clearance for reduced vibration and mechanical noise.

Adjustment of gear backlash between clutch primary gears and balancer gears achieves further mechanical noise reduction.

A new, larger-diameter titanium exhaust header with revised taper characteristics enhances exhaust efficiency.

First “punched cone” muffler ever on a production bike allows 35 percent length reduction and 270-gram weight reduction while meeting AMA noise regulations.

Matte black crankcase covers: light, strong and cool-looking.

Steering head pipe and steering stem are 5mm shorter; lower forged triple steering clamp is lighter—for enhanced handling feel. Swingarm pivot stiffness is revised to complement front-end changes and further lighten and improve steering/handling.

Changes to the shape of the outer fork tubes and revised internals result in improved damping and a smoother ride.

Optimized linkage ratio provides a smoother ride and enhanced rear wheel traction.

New, YZ250F-style, front-brake caliper (-220 grams) and a lighter disc remove unsprung weight and provide excellent stopping power. A new axle and collar remove additional weight.

A 120/80-19 rear Dunlop D756 knobby replaces the 110/90-19 for even more traction. A D742FA replaces the D739FAL front tire.

Wider footpegs provide excellent boot traction and rider comfort.


Engine:


449cc five-valve DOHC liquid-cooled engine is super-powerful yet tractable.

39mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) and leak jet delivers precise fuel/air mixture and instant throttle response.

Lightweight titanium valves and load-reduced springs minimize reciprocating mass for fast-revving, hard-hitting power delivery across the rev range.

Primary kickstarting with automatic decompression and convenient, handlebar-mounted hot start lever ensures easy restarts.

Large-capacity radiator is reinforced for greater strength.


Chassis/Suspension:


Extensively tested aluminum frame uses a mix of alloy castings, forgings and extrusions to produce a tuned-flex frame that makes the YZ the finest-handling motocross bike ever.

Speed-Sensitive System 48mm Kayaba fork places transfer control valves (TCV) above the fork springs, so that damping force is controlled by piston speed: Eliminating mid-stroke damping force changes provides a smoother, more precise ride.

Titanium-sprung, four-way adjustable rear shock with Kashima-coated internals reduces friction for fantastic compliance 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 of square-section tubing for light weight and easy maintenance.

Lightweight front-wheel hub for reduced unsprung weight and increased durability.

Lightweight front- and rear-brake calipers with aluminum pistons and anti-bubble front master cylinder; wave-style rotors reduce unsprung weight and deliver strong stopping power.


Additional Features:


“Gripper” style seat cover gives excellent feel and control.

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.

Durable, comfortable handlebar grips.


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SPECS


Engine

Type: 449cc liquid-cooled DOHC 4-stroke; 5 titanium valves

Bore x Stroke: 95.0 x 63.4mm

Compression Ratio: 12.3:1

Carburetion: FCR-MX39 x 1

Ignition: CDI

Transmission: Constant-mesh 5-speed; multiplate wet clutch

Final Drive: Chain Drive


Chassis

Suspension/Front: Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel

Suspension/Rear: Fully adjustable single shock; 12.3-in travel

Brakes/Front: Hydraulic single disc brake, 250mm

Brakes/Rear: Hydraulic single disc brake, 245mm

Tires/Front: 80/100-21-51M

Tires/Rear: 120/80-19-62M


Dimensions

Length: 86.4 in

Width: 32.5 in

Height: 51.4 in

Seat Height: 38.9 in

Wheelbase: 58.8 in

Ground Clearance: 14.7 in

Dry Weight: 219 lb

Fuel Capacity: 1.8 gal


Other

Warranty: 30 Day (Limited Factory Warranty)

MSRP:

  • $7,099 (Team Yamaha Blue/White)  Available from July 2007
  • $7,199 (White/Red)  Available from July 2007