2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 98Get this manual
FUEL SYSTEM Set the thrust washer between the valve arm and carburetor body (th rottle drum side) Insta ll the return spring by hanging the large end onto carburetor boss (stopper) and set the throttle link arm over the springInsert the link arm shaft through the link armcarburetor bodythrust washer and valve arm Hang the shaft hook to the spring small endTurn the link arm shaft clockwise and set the shaft tab onto the link arm as shown Align the screw holes In 1he valve arm and sha ftinstall the screw ith th spring washer and tighten it securelyTurn the throttle drum and check for smooth operationMake sure that the clearance between the throttle link arm and shaft tab is 0.10.3 mm (0 .0040.012 in) when the th rottle va lves are fLllly closed Adjust the clearance by opening or closing the slit in the link arm