New for the 2006 Yamaha YZ450F:

• New, close-ratio five-speed transmission provides more performance in a wider range of riding environments.
• All-new aluminum frame is an extensively tested combination of castings, extrusions, forgings and aluminum tubing — all carefully put together to produce a chassis that takes legendary YZ handling to the next level.
• Speed-Sensitive System 48mm Kayaba fork move the TCV (transfer control valves) above the fork springs, so that damping force is now controlled by piston speed; that prevents mid-stroke damping force changes, for a smoother, more precise ride.
• Titanium-sprung four-way adjustable rear shock rod diameter is 2mm bigger. New, Kashima coating reduces friction for fantastic compliance and great handling.
• Carburetion and exhaust changes let the 449cc four-stroke breathe free for even greater power production.
• Changing the cylinder head angle and moving the dry sump oil tank inside the front of the crankcase improves overall balance and handling and eliminates external oil lines.
• Redesigned piston, crankshaft and connecting rod for increased performance and durability. An oil jet now directs oil at the piston bottom for increased cooling.
• Trick new bits include a light, strong ProTaper aluminum handlebar in adjustable clamps and a trick new exhaust system.
• A special 50th anniversary model.