1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 85Get this manual
CYLINDER HEADVALVES VALVE SEAT CUTTERS
Valve Seat Cutters, grinder or equivalent valve seat refacing equipment are recommended to correct worn valve seat
NOTE Follow the refacer manufacturer's operating instructions
VALVE SEAT REFACING
Use 45 degrees cutter to remove any roughness or irregularities from the seatNOTE Reface the seat with 45 degrees cutter whenever valve guide is replaced