2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 130Get this manual
FUEL SYSTEM PRIMER KNOB Install the primer knob with the spring and tighten the two screws, being careful not to pinch the diaphragmASSEMBLY
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
DIAPHRAGMI VACUUM PISTON
SPRING Turn the needle holder clockwise while pressing it until it locksHolder flange should be fitted the vacuum piston after turning