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1.Measure the contact width of the valve face and the valve seat using the valve lapping compound.

• If it is not within the specification, resurface the valve seat using the 45° valve seat cutter.

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Standard width:

1.2—1.6 mm {0.048—0.062 in}

2.Verify that the valve seating position is at the center of the valve face.

• If the seating position is too inner side, correct the valve seat using a 70° (IN) or 65° (EX) cutter, and a 45° cutter.

• If the seating position is too far inside, correct the valve seat using a 30° (IN) cutter, and a 45° cutter.

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Valve seat angle:

IN: 45°

EX: 45°

3.Inspect the sinking of the valve seat. Measure the protruding length (dimension L) of the valve stem.

• If not specified, replace the valve.

― If not as specified, replace the cylinder head.

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