2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 133Get this manual
FUEL SYSTEM ('04'05) THROTTLE VALVE Install the needle clip on the jet needleSTANDARD CLIP POSITION: 3rd groove from top Install the jet needle into the throttle valveTHROTTLE VALVE
NEEDLE CLIP
JET NEEDLE Install the link arm into the throttle valve and tighten the two screwsInstall the throttle valve assembly into the carburetor body, being careful not to damage the jet needleLINK ARM THROTTLE VALVE