Remove the valve and spring from the cylinder head.
(See Cylinder Head Disassembly And Assembly on Page 60-80-7.)
Clean the valve seat and combustion chamber.
Install the valve into the guide. Measure the valve recessing with a depth gauge [Figure 60-80-24].
If the measurement exceeds the limit, replace the valve or cylinder head [Figure 60-80-25].
Remove the carbon from the valve guide.
Measure the valve stem O.D. [Figure 60-80-26].
Measure the valve guide I.D. [Figure 60-80-26].
Calculate the clearance. If the clearance exceeds the allowable limit, replace the valve and / or valve guide.