2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 107Get this manual
FUEL SYSTEM Be careful not to pinch the diaphragm under the chamber cover, and to keep the spring straight when compressing the spring
Install the spring and vacuum chamber cover while the piston remains held in placeAlign the concave of the cover with the air passage in the carburetor body and secure the cover with at least two screws before releasing the vacuum piston
VACUUM CHAMBER COVER
SPRING Install the screws with the clamps and tighten them