2003 Honda ATV TRX650FA Rincon Factory Service Manual, Page 158Get this manual
CYLINDER HEADIVAlVElCAMSHAFT
VA LV SEAT INSPECTIONREFACING
INSPECTION
Clean all intake and exha ust valves thoroughly to remove carbon depositsApply light coat of Pru ssla Blue to each valve
seatTap the valve aga inst he va lve seat several ti mes without rotating he alve, to check for proper va lve
seat contact
The valve cennot be groundIf the valve face is burned or badly orn or if it unevenly, replace the val ve
Remove the va lve an ins pect the valve seat faceThe valve seat contact should be it hin he specified idth and even all aro un he circumference