• Remove the valve (see Valve Removal).
• Check the valve seating surface [A] between the valve [B] and valve seat [C].
OMeasure the outside diameter [D] of the seating pattern on the valve seat.
★ If the outside diameter is too large or too small, repair the seat (see Seat Repair).
Valve Seating Surface Outside Diameter Standard:
Inlet 29.4 ~ 29.6 mm (1.1575 ~ 1.1654 in.) Exhaust 25.2 ~25.4 mm (0.992 ~ 1.000 in.)
OMeasure the seat width [E] of the portion where there is no build-up carbon (white portion) of the valve seat with a vernier caliper. Good [F]
★ If the width is too wide [G], too narrow [H] or uneven [J], repair the seat (see Valve Seat Repair).
Valve Seating Surface Width Standard:
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