Yamaha YZ490 Spark Plug
The Yamaha YZ490 (490cc) takes an NGK BR8EIX spark plug, gapped to 0.024".
Key takeaways
- Iridium plug: NGK BR8EIX.
- Iridium upgrade available in the same fit.
- Gap: 0.024 inch - set it before fitting.
- Covers 1973-1987 (plug changed across years - see table).
Buy the plugs for your Yamaha YZ490
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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Yamaha YZ490 spark plugs by year
| Years | Standard | Iridium | Gap |
|---|---|---|---|
| 1982-1987 | - | BR8EIX | 0.024" |
| 1973-1974 | BR8EIX | - | 0.024" |
Frequently asked
What is the spark plug gap for a Yamaha YZ490?
The spark plug gap for the Yamaha YZ490 is 0.024 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 Yamaha YZ490?
Yes. The BR8EIX is the iridium version of the null - same fit, longer life, and a slightly stronger spark. It is a straight upgrade.
More parts for your Yamaha YZ490
We cover the other consumables for your machine too - the exact fit, cited, in one place.