CrankDex

Yamaha XS400R Spark Plug

The Yamaha XS400R takes an NGK BR8ES spark plug, gapped to 0.032".

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Key takeaways

  • Spark plug: NGK BR8ES.
  • Iridium upgrade: NGK CR8EIX.
  • Gap: 0.032 inch - set it before fitting.
  • Covers 2003-2010.
Standard PlugBR8ES
Iridium UpgradeCR8EIX
Gap0.032"
Verified fitLast checked
Sources: NGK powersports application catalogue
Reviewed by the CrankDex editorial team against manufacturer and retailer fitment data.

Buy the plugs for your Yamaha XS400R

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.

Shop the BR8ES plugStandard NGK plug + multi-packsShop Upgrade: CR8EIX iridiumLonger life, stronger sparkShop

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Frequently asked

What spark plug does a Yamaha XS400R take?

The Yamaha XS400R takes an NGK BR8ES spark plug, gapped to 0.032 inch. The iridium upgrade is the CR8EIX.

What is the spark plug gap for a Yamaha XS400R?

The spark plug gap for the Yamaha XS400R is 0.032 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 XS400R?

Yes. The CR8EIX is the iridium version of the BR8ES - same fit, longer life, and a slightly stronger spark. It is a straight upgrade.

More parts for your Yamaha XS400R

We cover the other consumables for your machine too - the exact fit, cited, in one place.

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