Aprilia ST 125 Spark Plug
The Aprilia ST 125 (125cc) takes an NGK CR8E spark plug, gapped to 0.024".
Key takeaways
- Spark plug: NGK CR8E.
- Iridium upgrade: NGK CR8EIX.
- Gap: 0.024 inch - set it before fitting.
- Covers 1999-2004.
Buy the plugs for your Aprilia ST 125
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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Frequently asked
What spark plug does a Aprilia ST 125 take?
The Aprilia ST 125 takes an NGK CR8E spark plug, gapped to 0.024 inch. The iridium upgrade is the CR8EIX.
What is the spark plug gap for a Aprilia ST 125?
The spark plug gap for the Aprilia ST 125 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 Aprilia ST 125?
Yes. The CR8EIX is the iridium version of the CR8E - same fit, longer life, and a slightly stronger spark. It is a straight upgrade.
More parts for your Aprilia ST 125
We cover the other consumables for your machine too - the exact fit, cited, in one place.