2004-2006 Honda FourTrax Rancher TRX350TE/TM/FE/FM Service Manual, Page 137Get this manual
CYLINDER HEADVALVE
VALVE SEAT INSPECTIONREFACING
INSPECTION
Clean all intake and exhaust valves thoroughly to remove carbon deposits, Apply light coa ng of Pruss ian Blue to eac valve seatTa the valve against the va lve sea seve ral times it hout rotatin the valve, check for proper valve seat contact-
The 'Ialve cannOI be ground If the valve face IS oumed or badly '10m or rl rl conraCI rn seal ur"'e replace Ine '.t!ve
Remove the valve and inspect the alve sea face Th valve sea co ntact should be within th specifi ed width and even all around he circum erence,