The Honda 30500-Z5T-004 Ignition Coil Assembly (IIDA) is a genuine OEM ignition coil assembly designed for GX340 and GX390 horizontal shaft engines, EB4000, EB5000, EB6500, EG5000, EG6500, EM3800, EM4000, EM5000, and EM6500 generators, and the WT40 water pump. As a direct Honda OEM component, this ignition coil assembly is manufactured to the same specification as the part originally fitted at the factory, ensuring the proper spark timing and output voltage your equipment depends on. Confirm your machine's serial number against the fitment table before ordering, as Honda supersedes ignition components at specific production breaks.
Key Features
- Genuine OEM Ignition Output — Honda-sourced coil engineered to deliver the correct primary-to-secondary voltage ratio and dwell characteristics for consistent spark energy across the full operating range of your engine.
- Broad Cross-Equipment Compatibility — fits GX340 and GX390 horizontal shaft engines, EB4000, EB5000, EB6500, EG5000, EG6500, EM3800, EM4000, and EM5000 and EM6500 generators, and the WT40 water pump, making this a widely stocked service part.
- Verified Part Number — order using part number 30500-Z5T-004 to confirm you are receiving the correct IIDA-variant coil assembly, not a superseded predecessor unit.
- Serial Number Match Recommended — Honda updates ignition coil specifications at production serial breaks; check your machine's serial number against the compatibility table to confirm this assembly is correct for your unit.
- Restore Clean Starting and Steady Running — a weakened or failed ignition coil causes hard starting, misfiring under load, and unexpected shutdowns; replacing it with this OEM assembly restores full spark reliability.
An ignition coil transforms low-voltage current from the engine's charging system into the high-voltage pulse needed to fire the spark plug at precisely the right moment in each combustion cycle. When the coil weakens or fails, spark energy drops, leading to difficult cold starts, rough running, or a complete no-start condition — particularly under load when combustion demands are highest. Keeping a healthy ignition coil in service is essential to the consistent output performance of both the engines and the generators and pump this assembly supports.
Part Details
| Part Number | 30500-Z5T-004 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Ignition Coil Assembly (IIDA) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB4000, EB5000, EB6500, EG5000, EG6500, EM3800, EM4000, EM5000, EM6500 | All |
| Horizontal Shaft Engine | GX340, GX390 | All |
| Water Pump | WT40 | All |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
