2005 Yamaha YZ450F

Additional Features:

• “Gripper” style seat cover offers excellent feel and control.
• Wide, cleated, folding titanium footpegs are light, strong, and provide excellent comfort, grip and ground clearance.
• Cleated rear brake lever and folding shift lever tip offer superb grip and excellent durability.
• Repackable exhaust silencer.
• Durable, comfortable handlebar grips.
• Stainless steel clutch cable for longer life.

Chassis/Suspension:

• Super-strong frame is lightweight and rigid for minimal flex and razor-sharp 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 pipe for light weight and easy maintenance.
• Rear suspension system features fully adjustable Kayaba shock with improved rebound circuitry, 12.4 inches of travel, and separate adjusters for high- and low-speed compression damping.
• Lightweight front wheel hub for less unsprung weight and increased durability.
• Lightweight front and rear brake calipers with aluminum pistons and anti-bubble front master cylinder, 250mm front and 245mm rears discs, deliver strong stopping power with progressive feel.
• Premium Dunlop 739 knobbies provide unbeatable, competition-spec traction and great wear.
• Lightweight 21-inch front and 19-inch rear Excel rims are exceptionally durable and reduce unsprung weight.

Engine:

• Liquid-cooled, 449cc, 5-valve, DOHC, four-stroke with titanium valves features 63.4mm stroke delivering flat, broad torque curve (for instant hook-up) with high over-rev capacity and crisp, linear throttle response.
• 39mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) and leak jet delivers precise fuel/air mixture and instant throttle response.
• Lightweight crankshaft keeps inertial mass to a minimum for faster-revving low-rpm response.
• Lightweight forged piston with short skirt and small pin diameter.
• Lightweight, titanium valves and load-reduced springs are super-light, minimizing reciprocating mass for fast-revving, hard-hitting power delivery across the rev range.
• Additional weight-saving engine features include: small-design cam chain tensioner and oil pump; aluminum oil hose; all-titanium exhaust header, flange, bracket and heat shield; and light CDI ignition unit.
• Primary kickstarting (with automatic decompression and convenient handlebar-mounted hot start lever) ensures easy restarts.
• Kick pinion gear is separate from the primary driven gear, for smoother clutch engagement.
• Redesigned airbox with new double-ribbed carburetor joint for improved seal and serviceability.
• Smooth-shifting 4-speed transmission delivers engine’s potent powerband to the ground with maximum efficiency and hook-up.
• Large-capacity radiator provides outstanding cooling efficiency.
• Trick, works-style clutch lever features oversize barrel adjuster for easy, on-the-fly adjustability of lever/cable play.

New for 2005:

• Faster and smoother than ever.
• Redesigned combustion chamber, piston, intake ports, carburetor jetting and airbox for improved combustion efficiency, resulting in smoother more controlled power delivery.
• Redesigned CDI unit for smoother more controlled power delivery.
• Primary drive gear ratio has been changed from 2.82 to 2.65:1, clutch spring rate is reduced 6 percent for lighter lever pull, and a new shift mechanism provides more positive shifting.
• All-new fork with TCV (transfer control valve) for stable damping, improved mid- to full-stroke performance and better rider feedback.
• New, aluminum Renthal handlebar is 90 grams lighter and more durable.
• Revised triple clamps for even better handling.
• Shorter, re-routed front brake hose for increased brake feel and easier bleeding.
• Stronger swingarm with stronger new linkage for better performance.
• Rear shock has a new, full-rebound oil lock circuit for a smoother ride.
• New-design rear sprocket and chain guide reduces wear, chain wobble, and noise for more efficient power transfer.
• Rear brake bracket is 35 grams lighter, and designed for easier rear wheel installation.
• New front fork protectors are larger for better coverage.