The Honda 98079-55841 Spark Plug (BP5ES) is a genuine OEM ignition component designed for a wide range of Honda horizontal shaft engines, vertical shaft engines, and walk-behind lawn mowers. This spark plug covers the GX120, GX160, and GX390 horizontal shaft engines, the GXV120 vertical shaft engine, and Honda HR-series and HRC-series lawn mowers including the HR194, HR195, HR214, HR215, HR216, HRA214, HRA215, HRA216, HRC215, and HRC216. As a genuine OEM part carrying part number 98079-55841, it is manufactured to Honda's own specifications — not a generic substitute. Honda supersedes spark plugs at service intervals and serial breaks, so always cross-reference your machine's serial number against the fitment table before ordering to confirm this is the correct plug for your unit.
Key Features
- OEM Ignition Integrity — the BP5ES heat range and electrode geometry are specified by Honda for correct spark timing and combustion efficiency across each covered application, not approximated from a generic plug.
- Direct-Fit Replacement — this plug installs in place of the original with no gapping guesswork; the thread pitch, reach, and seat type match the Honda cylinder head specification for each covered model.
- Broad Honda Coverage — fits GX120, GX160, and GX390 horizontal shaft engines, GXV120 vertical shaft engines, and HR194, HR195, HR214, HR215, HR216, HRA214, HRA215, HRA216, HRC215, and HRC216 lawn mowers — verify your serial number against the fitment table to confirm applicability.
- Engine Starting and Power Delivery — a fresh, correctly rated spark plug fires the air-fuel mixture cleanly at every compression stroke; a fouled or worn plug causes hard starting, rough idle, and loss of power under load.
A spark plug is the ignition source of a four-stroke engine: at the top of each compression stroke, the plug fires an electrical spark across its electrode gap, igniting the compressed air-fuel mixture and driving the piston down to produce power. The heat range of the plug — encoded in the BP5ES designation — determines how quickly the electrode dissipates combustion heat, keeping it cool enough to resist pre-ignition but hot enough to burn off carbon deposits. When a spark plug wears, the electrode gap widens, voltage demand rises, and the ignition system struggles to fire consistently — resulting in rough running, difficulty starting, and higher fuel consumption. Replacing the plug at the recommended service interval with the correct OEM-specified part restores clean ignition and full engine output.
Part Details
| Part Number | 98079-55841 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Spark Plug (BP5ES) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX120, GX160, GX390 | 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.
