Honda 88-91 NT650 HAWK GT Serviceanleitung Seite 116

Use a 32 degree cutter to remove the top 1/4 of the existing
valve seat material.
Use a 60 degree cutter to remove the bottom 1/4 of the old
seat. Remove the cutter and inspect the area you have
refaced.
Install a 45 degree finish cutter and cut the seat to the proper
width. Make sure that all pitting and irregularities are removed.
Refinish if necessary.
Apply a thin coating of Prussian Blue to the valve seat. Press
the valve through the valve guide and onto the seat to make a
clear pattern.
NOTE
The location of the valve seat in relation to the valve face is
very important for good sealing.
If the contact area is too high on the valve, the seat must be
lowered using a 32 degree flat cutter.
CYLINDER HEAD/VALVES
(1) CONTACT TOO HIGH
9-13