2000-2003 Honda TRX350 Rancher factory service manual, Page 91Get this manual
FUEL SYSTEM Install the air cut-off valve and secure it with the screw
Turn the throttle stop screw to align the butterfly throttle valve with the edge of the outside by-pass hole in the carburetor body, If the throttle stop screw was removed
THROTTLE STOP SCREW
Install the collar and carburetor heater with the stepped side of the collar facing the carburetor and tighten it