2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 231Get this manual
CARBURETOR
INSTALLING THE CARBURETOR 1Install: carburetor NOTE: Align the projection on the carburetor with the slot in the carburetor joint, and then align the projection on the carburetor with the slot in the air intake ductInstall: throttle cable throttle cable cover Adjust: throttle lever free play Refer to "ADJUSTING THE THROTTLE LEVER FREE PLAY" in chapter 34Adjust: engine idling speed Refer to "ADJUSTING THE ENGINE IDLING SPEED" in chapter 3EAS00502
CHECKING AND ADJUSTING THE THROTTLE POSITION SENSOR NOTE: Before adjusting the throttle position sensor, the engine idling speed should be properly adjusted_