1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 136Get this manual
CYLINDER HEADCYUNDERPISTON App ly thin coating of Prussian Blue to the va lve seatPress the va lve through the valve gui de and' onto th seat tomake clear patternil the conhact area is tooO high on the valve, the must be lowered using 32-degree fila,r cutter,
Thei0Cl11ion valve seat in
CONTACT TOO HIGH
feauon to .the vaJv8
imporlantforgoOtJ
sealing