1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 228Get this manual
CARBURETOR
ICARBIIiII
8.Check: Free movement (piston valve) Sticks Replace piston valve guide and piston valveInsert the piston valve into the carburetor body, and check for free movement9.Check: Free movement (throttle valve) Sticks ReplaceCARBURETOR ASSEMBLY
Before reassembling, wash all of the parts in clean petroleum based solvent
1.lnstall: Needle jet CD
NOTE: Align the groove on the needle jet with the projection on the carburetor body Install the needle jet from the piston valve side