Honda CM400C Spark Plug
The Honda CM400C (360cc) takes an NGK DR8EA spark plug, gapped to 0.032".
Key takeaways
- Spark plug: NGK DR8EA.
- Iridium upgrade: NGK BR8EIX.
- Gap: 0.032 inch - set it before fitting.
- Covers 1980-1981.
Buy the plugs for your Honda CM400C
The standard plug is the exact-fit replacement. The iridium version drops into the same spot, lasts longer, and fires a little stronger for a few dollars more. Many engines take more than one - check how many cylinders you have.
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Frequently asked
What spark plug does a Honda CM400C take?
The Honda CM400C takes an NGK DR8EA spark plug, gapped to 0.032 inch. The iridium upgrade is the BR8EIX.
What is the spark plug gap for a Honda CM400C?
The spark plug gap for the Honda CM400C is 0.032 inch. Check and set the gap before fitting a new plug - most powersports plugs need a small adjustment out of the box.
Can I use an iridium plug in a Honda CM400C?
Yes. The BR8EIX is the iridium version of the DR8EA - same fit, longer life, and a slightly stronger spark. It is a straight upgrade.
More parts for your Honda CM400C
We cover the other consumables for your machine too - the exact fit, cited, in one place.