The Honda 98076-54710 Spark Plug (B-4H) is a genuine OEM replacement designed for G150, G200, G300, and G400 horizontal shaft engines, as well as EG1500 and ER1500 generators. As a factory-original component, this spark plug is specified directly by Honda, ensuring the correct heat range and thread dimensions for these engines and the equipment they power. Verify your machine's serial number against the fitment table to confirm this is the right plug for your unit before ordering.
Key Features
- Correct Heat Range for These Engines — the B-4H designation specifies the exact thermal rating Honda engineers selected for the G-series and EG/ER generator engines; the wrong heat range causes fouling or pre-ignition, so matching this designation matters
- Genuine OEM Part — sourced directly from Honda, this spark plug meets the same specification as the plug installed at the factory, with no guesswork about thread pitch, reach, or electrode gap
- Broad Legacy Fitment — listed for G150, G200, G300, and G400 horizontal shaft engines, as well as EG1500 and ER1500 generators; confirm your serial number against the fitment table before installing
- Ignition Performance — a fresh, properly gapped plug delivers a strong, consistent spark that supports clean combustion, easy starting, and smooth power output; a worn or fouled plug causes hard starting, misfires, and increased fuel consumption
A spark plug ignites the compressed air-fuel mixture inside the engine's combustion chamber, triggering the power stroke that drives the crankshaft. Each plug fires thousands of times per minute, and over time the electrode wears, the gap widens, and ignition becomes inconsistent. In the G-series horizontal shaft engines and EG/ER generators this plug serves, a degraded spark plug typically shows up as hard starting, rough idle, or a noticeable drop in power — replacing it with the correct OEM plug restores crisp ignition and efficient combustion.
Part Details
| Part Number | 98076-54710 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Spark Plug (B-4H) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EG1500, ER1500 | All |
| Horizontal Shaft Engine | G300 | 1103183-9999999 |
| Horizontal Shaft Engine | G400 | 1269742-9999999 |
| Horizontal Shaft Engine | G150, G200 | 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.
