1997-2001 Honda TRX250 Fourtrax Recon Service Manual, Page 113Get this manual
CYLINDER HEADCYLINDERPISTON Reface the seat with 45-d egree cutter whenever valve gUide is eplaced
Use 45-degree cutter to remove any roughness or irregularities from the seat
ROUG HNESS
Use 32-degree cutter to remove the top 1 of the existing valve seat material
Use 50-degree cutter to remove the bottom 1 of the old seatRemove the cutter and inspect the area you have retaced