Honda XR100 Spark Plug
The Honda XR100 takes an NGK CR7HSA spark plug, gapped to 0.028".
Key takeaways
- Spark plug: NGK CR7HSA.
- Iridium upgrade: NGK DR8EIX.
- Gap: 0.028 inch - set it before fitting.
- Covers 1974-1985 (plug changed across years - see table).
Buy the plugs for your Honda XR100
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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Honda XR100 spark plugs by year
| Years | Standard | Iridium | Gap |
|---|---|---|---|
| 1982-1985 | CR7HSA | DR8EIX | 0.028" |
| 1974-1978 | DR8EA | CR7HIX | 0.028" |
Frequently asked
What spark plug does a Honda XR100 take?
The Honda XR100 takes an NGK CR7HSA spark plug, gapped to 0.028 inch. The iridium upgrade is the DR8EIX. See the by-year table for earlier models.
What is the spark plug gap for a Honda XR100?
The spark plug gap for the Honda XR100 is 0.028 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 XR100?
Yes. The DR8EIX is the iridium version of the CR7HSA - same fit, longer life, and a slightly stronger spark. It is a straight upgrade.
More parts for your Honda XR100
We cover the other consumables for your machine too - the exact fit, cited, in one place.