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Should be about .035-.040. Platinum-tipped plugs rarely need gapping, and I highly recommend you use NGK or Denso plugs. One of those brands was original equipment. And, they come pre'gapped with a protective sleeve to make sure the gap is not altered during shipment. But they ain't cheap; about $6-8 apiece, but worth it if you love your Honda. I love mine!

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17y ago
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Q: What is the spark plug gap measurement for a 1999 Honda accord ex?
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