1999-2002 TRX400EX Fourtrax Service Manual, Page 99Get this manual
CYLINDER HEADVALVE
REFACING
NOTE: Follow the refacing manufacturer's operating instructions Be careful not to grind the seat more than necessary
If the contact area is too high on the valve, the seat must be lowered using 32" flat cutterIf the contact area is too Iowan the valve, the seat must be raised using 60" interior cutterCONTACT TOO HIGH
OLD SEAT WIDTH
Using 45" seat cutter, remove any roughness or irregularities from the seatTOOLS Valve seat cutter, 35 mm HN) Valve seat cutter, 29 mm (EX) Cutter holder, 5.5 mm