2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 100Get this manual
CYLINDER HEAOVALVE
VALVE SEAT INSPECTIONREFACING
INSPECTION
Clean all intake and exhaust valves thoroughly to remove carbon depositsApply light coating of Prussian Blue to each valve
seatTap the valve against the valve seat several times
without rotating the valve, to check for proper valve
seat contact
Remove the valve and inspect the valve seat faceThe valve seat contact sh ould be within the specified width and even all around the circumference
STANDARD: 1.2 mm {O.OS int
SERVICE LIMIT! 1.5 mm (0 .06 in)