Yamaha YZ125 Spark Plug
The Yamaha YZ125 (125cc) takes an NGK BR9EIX spark plug, gapped to 0.024".
Key takeaways
- Iridium plug: NGK BR9EIX.
- Iridium upgrade available in the same fit.
- Gap: 0.024 inch - set it before fitting.
- Covers 1974-2006 (plug changed across years - see table).
Buy the plugs for your Yamaha YZ125
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.
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Yamaha YZ125 spark plugs by year
| Years | Standard | Iridium | Gap |
|---|---|---|---|
| 2006 | - | BR9EIX | 0.024" |
| 1974-1976 | BR9ES | BR9EIX | 0.024" |
Frequently asked
What is the spark plug gap for a Yamaha YZ125?
The spark plug gap for the Yamaha YZ125 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 YZ125?
Yes. The BR9EIX 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 YZ125
We cover the other consumables for your machine too - the exact fit, cited, in one place.