1986-1988 Honda TRX 200SX Fourtrax Service Manual, Page 63Get this manual
CYLIND ER HEADV ALVES VALVE SEAT REFACING III ROUGHNESS
Use 45 degree cutter to remove any roughness or irregulanties from the seat
Refec the seal with 45 degree cutter when valve guide IS replaced
Use 32 degree cutter to remove the top 14 of the existing vallie seat material
Use 60 degree cutter to remolle the bottom 1 of the old seatRemove the cutter and inspect the area you halle refaced