Hiyeve Ignition Coil for Honda GX390 GX340 — 4‑Prong Replacement 30500‑Z5T‑003, Restores Spark Reliability

Hiyeve 30500-Z5T-003 is a four-prong ignition coil built to replace Honda OEM coils on many GX340/GX390 engines and compatible generators.

If your small engine is misfiring, hard to start, or running unevenly, the ignition coil is a common wear item. This Hiyeve replacement coil is manufactured to match the electrical connections and mounting of Honda OEM part numbers 30500-Z5T-003 and 30500-Z5R-003, making it a practical swap for maintenance and repairs on specific GX340, GX390 and select generator models. Before purchasing, confirm the OEM number stamped on your existing coil to ensure correct fit.

Which models and VIN ranges does this coil fit?

This Hiyeve coil fits a defined list of Honda engines and related generator models that share the same coil footprint and connector. Compatibility includes several GX340 and GX390 subtypes plus a range of EM and EB series generators. Check your engine VIN or OEM part label to match exactly.

• Fits Honda GX390 and GX340 variants listed in the compatibility set
• Compatible with EM/EB generator models such as EM5000SXK3 and EM6500SXK2
• Works where OEM numbers 30500-Z5T-003 or 30500-Z5R-003 are specified

How does this replacement coil affect engine performance?

An ignition coil’s role is storing and releasing the voltage needed for reliable spark at the spark plug. Replacing a failing coil can restore cranking response, reduce misfires, and help the engine run more consistently. It won’t change engine power specifications but improves ignition reliability.

• Improves spark consistency over a weakened coil
• Helps reduce starting difficulty and rough idling
• Restores reliable ignition timing for smoother operation

What should I check before ordering and during installation?

Confirm the OEM part number on your old coil — models and photos can look similar but vary by OEM code. During installation, ensure all electrical connectors are clean and the coil is mounted to the correct torque and grounding to avoid ignition issues.

• Compare OEM number on your engine to 30500-Z5T-003 / 30500-Z5R-003
• Inspect spark plug, plug wire, and connector fit before final assembly
• Secure mounting bolt and confirm ground path for correct operation

What support or warranty should I expect after purchase?

Hiyeve provides customer support channels for fitment or product concerns. If you receive a nonfunctional or incorrect part, contact the seller promptly so they can advise on troubleshooting, return, or replacement steps.

• Contact merchant or customer service for product issues
• Retain order and part photos to speed support
• Follow return instructions if the coil does not match your OEM number

Who is this for: This Hiyeve ignition coil is intended for mechanics, equipment owners, and technicians who maintain Honda GX340/GX390 engines or the listed EM/EB generator models and need a direct-fit OEM replacement. It’s useful when the original coil shows signs of wear—such as intermittent spark, hard starting, or rough running—and when the engine’s OEM number matches the replacement part. Always verify the part number before ordering to ensure compatibility with your specific VIN range.