Honda TRX300 Spark Plug
The Honda TRX300 (300cc) takes an NGK DR8EIX spark plug, gapped to 0.036".
Key takeaways
- Spark plug: NGK DR8EIX.
- Iridium upgrade available in the same fit.
- Gap: 0.036 inch - set it before fitting.
- Covers 1985-1987 (plug changed across years - see table).
Buy the plugs for your Honda TRX300
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 TRX300 spark plugs by year
| Years | Standard | Iridium | Gap |
|---|---|---|---|
| 1986-1987 | DR8EIX | - | 0.036" |
| 1985 | BR9ES | DPR8EIX-9 | 0.028" |
Frequently asked
What spark plug does a Honda TRX300 take?
The Honda TRX300 takes an NGK DR8EIX spark plug, gapped to 0.036 inch. See the by-year table for earlier models.
What is the spark plug gap for a Honda TRX300?
The spark plug gap for the Honda TRX300 is 0.036 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 TRX300?
Yes. The iridium version drops into the same spot - same fit, longer life, and a slightly stronger spark. It is a straight upgrade.
More parts for your Honda TRX300
We cover the other consumables for your machine too - the exact fit, cited, in one place.