2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 195Get this manual
ENGINE TOP END 6-27 Valves
Seat Cutter Operation Care 1This valve seat cutter is developed to grind the valve for repairTherefore the cutter must not be used for other purposes than seat repair2Do not drop or shock the valve seat cutter, or the diamond particles may fall off3Do not fail to apply engine oil to the valve seat cutter before grinding the seat surfaceAlso wash off ground particles sticking to the cutter with washing oil
Do not use wire brush to remove the metal particles
from the cutterIt will take off the diamond particles4Setting the valve seat cutter holder in position, operate the cutter in one handDo not apply too much force to the diamond portion
Prior to grinding, apply engine oil to the cutter and dur5After use, wash it with washing oil and apply thin layer of engine oil before toringMarks Stamped on the Cutter The marks stamped on the back of the cutter [A] represent the following60 Cutter angle [B] 37.5 Outer diameter of cutter [C]