KTM SX Spark Plug
The KTM SX (300cc) takes an NGK LKAR8A-9 spark plug, gapped to 0.036".
Key takeaways
- Spark plug: NGK LKAR8A-9.
- Iridium upgrade available in the same fit.
- Gap: 0.036 inch - set it before fitting.
- Covers 1979-2010 (plug changed across years - see table).
Buy the plugs for your KTM 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 SX spark plugs by year
| Years | Standard | Iridium | Gap |
|---|---|---|---|
| 2009-2010 | LKAR8A-9 | - | 0.036" |
| 2003-2005 | LKAR8A-9 | DCPR8EIX | 0.032" |
| 1996 | BR8ECM | BR8EIX | 0.024" |
| 1996 | - | BR8EIX | 0.024" |
| 1993-1994 | BR8ECM | BR9EIX | 0.024" |
| 1979 | CR8EK | BR9HIX | 0.024" |
Frequently asked
What spark plug does a KTM SX take?
The KTM SX takes an NGK LKAR8A-9 spark plug, gapped to 0.036 inch. See the by-year table for earlier models.
What is the spark plug gap for a KTM SX?
The spark plug gap for the KTM SX 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 KTM SX?
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 KTM SX
We cover the other consumables for your machine too - the exact fit, cited, in one place.