2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 106Get this manual
FUEL SYSTEM PRIMER KNOB Install the primer knob with the spring and tighten the two screws, being careful not to pinch the diaphragmPRIMER KNOB ASSEMBLY
VACUUM CHAMBER
Install the needle clip onto the jet needleInstall the washer onto the jet needle and insert the jet needle into the vacuum pistonInstall the spring into the needle holder and set the needle holder into the vacuum pistonWASHER JET NEEDLE