The Honda 98079-5585C Spark Plug (K16PR-UR) is a genuine OEM spark plug designed for GX440 horizontal shaft engines. As a factory-original component, this spark plug is specified directly by Honda for the GX440 and delivers the exact heat range and electrode configuration Honda engineers called for during design. Confirm your engine's serial number against the fitment table before ordering, as Honda periodically updates part numbers at production breaks.
Key Features
- OEM Heat Range Accuracy — the K16PR-UR designation identifies a specific heat range and electrode type engineered for the GX440's combustion and ignition requirements, ensuring proper spark timing and combustion efficiency
- Direct OEM Replacement — sourced from Honda's genuine parts program, this plug installs directly in place of the original with no modification needed to gapping or threading specifications
- GX440 Fitment — listed for GX440 horizontal shaft engines; confirm your serial number against the fitment table to ensure this is the correct plug for your production range
- Engine Performance Impact — a worn or fouled spark plug causes hard starting, misfires, and fuel waste; replacing with the correct OEM plug restores clean ignition and consistent power output
A spark plug ignites the compressed air-fuel mixture inside the engine's combustion chamber, and the K16PR-UR designation tells you the exact heat range this plug is rated for — too cold and the plug fouls with carbon deposits; too hot and it risks pre-ignition damage. In a GX440 horizontal shaft engine, running the correct OEM plug keeps combustion consistent across the power band and protects the cylinder head from the consequences of misfiring or improper heat dissipation. When a plug wears out, electrode erosion increases the voltage demand on the ignition coil and leads to the rough running and hard-starting symptoms that a fresh genuine plug immediately corrects.
Part Details
| Part Number | 98079-5585C |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Spark Plug (K16PR-UR) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX440 | 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.
