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1.Measure the seat contact width.

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• If not within the specification, resurface the valve seat using a 45° valve seat cutter and/or resurface the valve face.

Valve seat contact width (Standard)

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.

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• 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.

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.

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• If not specified, replace the cylinder head.

Valve protrusion height (Standard)

IN: 40.64—42.24 mm {1.600—1.662 in}

EX: 40.50—42.10 mm {1.595—1.657 in}