MOTO1988 Ignition Coil & Spark Plug Set for Honda TRX400EX 1999-2006 — Direct-Fit, OEM Match

MOTO1988 replacement ignition coil and spark plug set designed to fit Honda Sportrax TRX400EX 1999–2006 models, supplied as a complete two-part ignition refresh.

If your Sportrax 400 is showing hard starts, weak throttle response, or inconsistent idling, worn ignition components are a common cause. This MOTO1988 kit bundles a direct-fit ignition coil and a quality spark plug matched to OEM part number 30500-HN1-003, simplifying repair and reducing diagnosis time. It’s sold as one ignition coil plus one spark plug and matches the factory specifications for the TRX400EX 2x4 across model years 1999 through 2006.

How will this coil and spark plug improve starting and idle?

Replacing degraded ignition parts restores reliable spark delivery so the engine fires cleanly at startup and maintains stable idle. Expect more consistent combustion and fewer misfires when components are within specification.

• Restores correct secondary voltage from the coil for reliable plugs firing.
• New spark plug ensures proper gap and spark energy for consistent combustion.
• Direct-fit design avoids wire modifications and fits OEM mounting points.

Will this part fit my Honda Sportrax TRX400EX?

This kit is compatible with TRX400EX 2x4 Sportrax models from 1999 to 2006 and references OEM 30500-HN1-003 for cross-checking. Always verify your vehicle’s year and OEM number before ordering to confirm compatibility.

• Coverage: Honda Sportrax 400 TRX400EX 2x4, model years 1999–2006.
• OEM reference: 30500-HN1-003 included for accurate matching.
• Check vehicle VIN or parts manual if you’re unsure about fitment.

How easy is installation for a home mechanic?

Installation is straightforward for anyone comfortable with basic ATV maintenance: remove the old coil and plug, transfer mounting points, and reconnect the wiring. No special tools are required beyond standard hand tools and a spark-plug socket.

• Remove seat and access panel to reach coil and plug area on TRX400EX.
• Use basic wrenches and a spark-plug socket—no electrical rewiring needed.
• Torque spark plug to manufacturer spec and ensure coil fasteners are secure.

What should I check before buying this ignition set?

Confirm your ATV’s model year and cross-reference the OEM part number to prevent fitment issues. Inspect wiring harness condition and mounting points—if those are damaged, the coil may need additional installation parts.

• Verify your TRX400EX year (1999–2006) and OEM 30500-HN1-003 match the listing.
• Examine harness connectors for corrosion or melted insulation before installing.
• Keep a backup of the factory parts for reference during installation.

Who is this for: This MOTO1988 ignition coil and spark plug set is aimed at owners and DIY mechanics of Honda Sportrax TRX400EX 2x4 ATVs from 1999 through 2006 who need a direct-fit replacement to restore dependable ignition performance. It’s also useful for shops servicing older Sportrax models that require OEM-compatible ignition components to bring engines back to smooth operation.

Package includes: 1 x ignition coil and 1 x spark plug. For questions about fitment or product support, contact MOTO1988 customer service by email for assistance and warranty information.