2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 119Get this manual
CYLINDER HEADVALVES Use 60 degree cu tter to remove the bottom 14 of the old seatRemove the cutte and inspect the area you have
OLD SEAT WIDTH
relaced
Install 45 degree finish cutter and cut the seat to the proper widthMake sure that all pitting and irregularities are removedRefinish if necessary
The location of the vav8 seat in
Apply thin coat of Prussian Blue to the valve seltPress the valve through the valve guide and onto Ihe seat to make clear patternIf the contact area is too high on the valve, the seat must be lowered using 32 degree flat cutter