2004 Yamaha YZ 250, For 2004, the list of updates and changes made to the blue bomber are minimal. The biggest news are the new 48mm Kayaba forks, which feature a new hydraulic bottoming system and revised internal valving. Out back, the shock has a new compression adjuster and a lighter shock spring. New titanium footpegs and a gripper seat cover pretty much round out the package, as the motor remains unchanged for the new year.