New for the 2006 Yamaha YZ250F on 4Strokes.com

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.
An all-new aluminum frame provides fantastic handling.
Carburetion and exhaust changes let the 249cc four-stroke breathe free all the way to 13,500 RPM, and a new radiator keeps it cool.
Moving the dry sump oil tank ahead of the engine provides overall balance and handling and minimizes external oil lines.
New CDI magneto provides a hot, consistent spark across the powerband for right-now throttle response.
Trick new bits include a light, strong ProTaper aluminum handlebar in adjustable clamps, Excel rims and a cool new exhaust system.
A special 50th anniversary model.