The Honda 98079-55854 Spark Plug (W16EP-U) is a genuine OEM replacement designed for GX120 and GX160 horizontal shaft engines, the GXV120 vertical shaft engine, and a wide range of Honda lawn mowers including the HR194, HR195, HR214, HR215, HR216, HRA214, HRA215, HRA216, HRC215, and HRC216. As a direct Honda OEM part, it is manufactured to the exact specification Honda requires for proper ignition performance. Confirm your machine's model and serial number against the fitment table before ordering, as Honda supersedes parts at production breaks and the W16EP-U designation identifies this specific plug grade and thread type.
Key Features
- Correct Heat Range and Electrode Spec — the W16EP-U grade is Honda's specified plug for these engines, delivering the electrode gap, heat range, and thread pitch Honda engineering calls for, not a general-purpose substitute.
- Genuine OEM Part — sourced directly from Honda, carrying part number 98079-55854, so there is no guesswork about whether the plug matches the ignition system in your engine or mower.
- Broad Fitment Across Honda Engines and Mowers — listed for GX120, GX160, and GXV120 engines as well as HR and HRC series lawn mowers; check your serial number against the fitment table to confirm your specific unit is covered.
- Clean Ignition, Every Start — a fresh, correctly specified spark plug produces a strong, consistent spark that supports complete combustion, easier cold starts, and smooth throttle response; a worn or fouled plug causes hard starting, misfires, and rough running.
A spark plug is the ignition source for a four-stroke petrol engine: a high-voltage pulse from the ignition coil jumps the electrode gap inside the combustion chamber, igniting the compressed air-fuel mixture that drives the piston. The plug's heat range determines how quickly it sheds combustion heat — too cold and the electrode fouls with carbon deposits; too hot and pre-ignition damage follows. When a spark plug wears, its gap widens, the electrode erodes, and the spark becomes weak or inconsistent, leading to hard starting, rough idle, increased fuel consumption, and power loss. Replacing it with the correct Honda OEM plug restores the ignition event the engine was designed around.
Part Details
| Part Number | 98079-55854 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Spark Plug (W16EP-U) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX120, GX160 | All |
| Lawn Mower | HR194, HR195, HR214, HR215, HR216, HRA214, HRA215, HRA216, HRC215, HRC216 | All |
| Vertical Shaft Engine | GXV120 | 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.
