Honda TRX400EX Fourtrac 400 EX Spark Plug
The Honda TRX400EX Fourtrac 400 EX (400cc) takes an NGK DPR7EA-9 spark plug, gapped to 0.035".
Key takeaways
- Spark plug: NGK DPR7EA-9.
- Iridium upgrade available in the same fit.
- Gap: 0.035 inch - set it before fitting.
- Covers 2002-2004.
Buy the plugs for your Honda TRX400EX Fourtrac 400 EX
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 Honda TRX400EX Fourtrac 400 EX take?
The Honda TRX400EX Fourtrac 400 EX takes an NGK DPR7EA-9 spark plug, gapped to 0.035 inch.
What is the spark plug gap for a Honda TRX400EX Fourtrac 400 EX?
The spark plug gap for the Honda TRX400EX Fourtrac 400 EX is 0.035 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 Honda TRX400EX Fourtrac 400 EX?
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 Honda TRX400EX Fourtrac 400 EX
We cover the other consumables for your machine too - the exact fit, cited, in one place.