1998-2004 Honda Foreman 450 factory service manual, Page 110Get this manual
FUEL SYSTEM AIR CUT OFF VALVE Install the a-rings, air jet and air cut off valveNOTE:
Note the direction of the air jet as shown
Install and tighten the screw securely
DIAPHRAGMVACUUM PISTON
Install the needle clip on the jet needleSTANDARD SETTING: 3rd groove from top