New for the 2005 Yamaha YZ250F:

• Redesigned combustion chamber, piston, intake ports, carburetor jetting and airbox for improved combustion efficiency and power.
• Redesigned CDI unit for optimal ignition timing.
• 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.
• Lighter, stronger swingarm with stronger new linkage for better performance and durability.
• 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.