The Honda 98079-5287E Spark Plug (FR2A) is a genuine OEM component designed for GX630, GX660, and GX690 horizontal shaft engines. Honda sources this plug to the exact heat range, electrode gap, and thread specification the engine requires, so it installs directly without adjustment. This is the correct OEM plug for all three of those large-displacement horizontal shaft engines — always confirm the part number 98079-5287E against your engine's parts diagram before ordering, as Honda supersedes plugs at serial breaks.
Key Features
- OEM Heat Range and Electrode Spec — engineered to Honda's exact thermal rating for the GX630, GX660, and GX690 engine family, ensuring complete combustion and clean firing under load
- Direct OEM Replacement — matches the original thread pitch, reach, and hex size, so this plug seats correctly and torques to spec without modification
- Broad Fitment Across the Large-Displacement GX Series — listed for GX630, GX660, and GX690 horizontal shaft engines; check your serial number against the fitment table, as Honda updates part numbers at serial breaks
- Consistent Ignition Performance — a worn or fouled spark plug causes hard starting, rough idle, and power loss; this genuine OEM plug restores a strong, consistent spark to keep the engine running at full output
A spark plug is the ignition source for the engine's combustion cycle — it receives a high-voltage pulse from the ignition coil and fires a spark across its electrode gap to ignite the air-fuel mixture in the cylinder. On large-displacement engines like the GX630, GX660, and GX690, the correct heat range is critical: a plug that runs too hot will pre-ignite the mixture, while one that runs too cold will foul with carbon deposits and misfire. When a spark plug wears out or becomes fouled, the result is hard starting, rough running, increased fuel consumption, and a noticeable drop in power output.
Part Details
| Part Number | 98079-5287E |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Spark Plug (FR2A) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX630, GX660, GX690 | 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.
