Check the valve seating surface [A] between the valve [B] and valve seat [С].
Measure 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 Valve Seat Repair).
Valve Seating Surface Outside Diameter
Standard: Inlet 26.1-26.3 mm
Standard: Exhaust 22.1-22.3 mm
Measure 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: Inlet, Exhaust 0.5-1.0 mm