1985-1987 Honda TRX 250 Fourtrax 250 Service Manual, Page 67Get this manual
CYLINDER HEADV ALVES Install 45 degree finish cutter and cut the seat to the proper idth Make sure that all pitting and irregularities are removed Refinish if necessarv
1.2 mm (0 .05 in)
Apply thin coating of Prussian Blue to the valve seatPress the valve through the valve guide and onto the seat to make a
(1CONTACT TOO HIGH
clear pattern NOTE
,(2) OLD SEAT WIDTH
The location of the valve seat in relalion to the valve face is very Important for good sealing If the contact area is too high on the valve, the seat must be lowered using 32 degree flat cutter