1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 75Get this manual
CYLINDER HEADV ALVES DISASSEMBL Y Remove the valve spring cotters, retainers, springs and valves with the Valve Spring Compressor
TOOL: Valve spring compressor CAUTION
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To prevent loss of tension, do not compress the valve springs more than necessary to remove the cottersNOTE
Mark all parts during disassembly so they can be placed back in their original locations
Remove the valve stem seals and valve spring seats
INSPECTION
CYLINDER HEAD Remove carbon deposits from the combustion chamber Clean any gasket material off the cylinder head surfaceCheck the spark plug hole and valve areas for cracksCheck the cylinder head for warpage with straight edge and feeler gaugeSERVICE LIMIT: 0.10 mm (0.004 in)