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Valve Seat

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  1. Grind valve seat to 45 degrees. If seat width is too wide after grinding, use a 30-degree stone to lower seat or a 60-degree stone to raise seat. See CYLINDER HEAD  table under ENGINE SPECIFICATIONS.
  2. Ensure valve seat angle, seat width and seat runout are within specification. See CYLINDER HEAD  table under ENGINE SPECIFICATIONS. Valve seats must be ground when valve guide is reamed or replaced. Replacement information is not available from manufacturer.
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