2001-2003 Honda TRX500FA Factory Service Manual, Page 98Get this manual
FUEL SYSTEM Turn th needl holder 90 degrees clockwise while pr essing it until it locks
NEEDLE HOLD ER
Be careful nor to
damage lh Ie! nee-
Install he diaphragrn,lvacuum piston into the carbureto body by aligning he tab of the iap hragm with the air passag e, then insert he jet needle into th need le
DIAPHRAGMPISTON
jet Lift the bottom of the piston with your finger to set the
diaphrag rib into the roove in th ca rb ureto body
Install he co pressio spri ng and acu um ch am ber cove while lifting th ist on in pla ceA lig th tab of th cover ith the air passage and secu re th cov er the auo-oe cover, with at least two screw before releasing th acuu and to keep the pist on10