Metering Rod

Remove air horn form carburetor and remove tamper resistant plug over metering rod. Reinstall air horn.
Use a dial indicator or gauge through hole in air horn. Pushing metering rod downward to its bottomed position, measure distance from air horn to top of metering rod adjusting screw. With throttle closed and metering rod spring lifting rod to its upper position, the amount of lift from bottomed position should be 0.050" (1.3 mm).
To adjust, rotate adjusting screw with a torx head, T-9 driver. After adjustment install tamper resistant plug.