2008 Yamaha YZ450F (discontinued)

Average User Rating: (Spectacular)
2008 Yamaha YZ450F  08YZ450F_FR3-4_blue
C70_08yz450f_fr3_4_blue C70_products.
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Vital MX Retail Partners:
Chaparral Motorsports MotoSport Rocky Mountain ATV/MC Motorcycle Superstore

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    Vital MX Retail Partners:
    Chaparral Motorsports MotoSport Rocky Mountain ATV/MC Motorcycle Superstore


    Model Year 2008
    Engine Type Liquid-cooled DOHC 4-stroke; 5 titanium valves
    Engine Displacement 449cc
    Bore x Stroke 95.0 x 63.4mm
    Compression Ratio 12.3:1
    Fuel System FCR-MX39 x 1
    Ignition CDI
    Transmission Constant-mesh 5-speed; multiplate wet clutch
    Final Drive Chain Drive
    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
    Overall Length 86.4 in
    Overall Width 32.5 in
    Overall Height 51.4 in
    Seat Height 38.9 in
    Wheelbase 58.8 in
    Ground Clearance 14.7 in
    Fuel Capacity 1.8 gal
    Curb Weight 219 lb
    Miscellaneous 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.



    • 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.



    • 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.
    Price $7099.00
    More Info

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

    $7,199 (White/Red)
    Available from July 2007

    Vital MX Retail Partners:
    Chaparral Motorsports MotoSport Rocky Mountain ATV/MC Motorcycle Superstore