1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 135Get this manual
CYLINDER HEADCYLINDERPISTON Reface tneseaj' Use 45-deg ree cutter to remove any roughness or curter whenever valve guide is
replaced
with 45-degrBI'J
irregularities from the seat
ROUGHNESS
Use .a 32'-degree cutter to remov'e the top 14 of he existing valve seat material
Use 60-degree cutter to remove the bottom 14 of the old seat Remove the cutte and inspect the area you have refaced