KTM 125 SX Spark Plug
The KTM 125 SX (125cc) takes an NGK BR9ECM spark plug, gapped to 0.024".
Key takeaways
- Spark plug: NGK BR9ECM.
- Iridium upgrade: NGK BR9ECMIX.
- Gap: 0.024 inch - set it before fitting.
- Covers 1991-2009 (plug changed across years - see table).
Buy the plugs for your KTM 125 SX
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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KTM 125 SX spark plugs by year
| Years | Standard | Iridium | Gap |
|---|---|---|---|
| 2008-2009 | BR9ECM | BR9ECMIX | 0.024" |
| 1998-2001 | R6918B-8 | - | 0.024" |
| 1995-1997 | BR10EG | BR10EIX | 0.024" |
| 1991-1994 | - | BR10EIX | 0.024" |
Frequently asked
What spark plug does a KTM 125 SX take?
The KTM 125 SX takes an NGK BR9ECM spark plug, gapped to 0.024 inch. The iridium upgrade is the BR9ECMIX. See the by-year table for earlier models.
What is the spark plug gap for a KTM 125 SX?
The spark plug gap for the KTM 125 SX 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 KTM 125 SX?
Yes. The BR9ECMIX is the iridium version of the BR9ECM - same fit, longer life, and a slightly stronger spark. It is a straight upgrade.
More parts for your KTM 125 SX
We cover the other consumables for your machine too - the exact fit, cited, in one place.