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I just realized that honda changed up the spark plug on us. The plugs in this motor are not anything like what they have been using for the last 30 years.

Mine came with a denso iridum, equivlent to a ngk 7 heat range.

If you want to step up to an 8 heat range you'll need ngk part# ILKR8E6, Stock number is 1422
 

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