1998-2004 Honda Foreman 450 factory service manual, Page 146Get this manual
CYLINDER HEADCYLINDERPISTON Apply thin coating of Prussian Blue to the valve seatPress the valve through the valve guide and onto the seat to make clear patternIf the contract area is too high on the valve, the seat must be lowered using 32-degree flat cutter
The location ofthe valve seat in relation to the valve face is very important for good sealing
CONTACT TOO HIGH
CONT ACT TOO LOW
If the contact area is too Iowan the valve, the seat must be ra ised using 60-degree inner cutterRefinish the seat to specifications, using 45-degree finish cutter