Honda Genuine OEM 98079-55846 Spark Plug BPR5ES; Replaces 98079-55876

What It Is

This is a genuine Honda BPR5ES spark plug (OEM part #98079-55846, superseding 98079-55876) designed for Honda small engines in walk-behind mowers, lawn tractors, generators, and pressure washers. It delivers the correct heat range and electrode gap to ensure reliable starting and efficient combustion.

Fitment & Compatibility

• Check your engine model: Fits Honda GXV, GCV, GSV, and HRX series engines, plus many older Honda mowers (e.g., HR214, HR215). Also used in some Honda generators (EU, EB series) and pressure washers.
• OEM vs aftermarket: This is genuine Honda, not a generic replacement. The plug is pre-gapped at 0.028–0.031 in., but always verify with a gap tool. Thread size is 14mm x 19mm (standard small engine).
• Physical check: Measure the reach (19mm) and hex size (13/16 in. or 21mm) to avoid clearance issues with your engine’s cylinder head.
• Cross-reference: Replaces Honda #98079-55876 directly; also equivalent to NGK BPR5ES (same spec). If your engine uses a resistor plug (e.g., BPR5ES vs BP5ES), this is the correct resistor type.

Key Things to Know

• Pre-gapped but verify: Honda sets the gap at 0.030 in., but shipping can knock it off. Always check and adjust with a feeler gauge before installing.
• Easy install: Requires only a spark plug socket (13/16 in.) and a ratchet. Torque to 18–22 ft-lb; overtightening can crack the insulator.
• Longevity: Replace every 100 hours or once per mowing season for best performance. A worn plug causes hard starting, misfires, and reduced power.
• Common gotcha: Don’t confuse with BPR5ES-11 (longer reach) or BPR6ES (colder heat range). Using the wrong plug can cause pre-ignition or engine damage.

Should You Buy It

If you own a Honda small engine mower or generator, this genuine OEM plug is the best choice—it matches factory specs, ensures reliable ignition, and avoids the hassle of aftermarket fitment issues. Ideal for DIY owners who want a drop-in replacement with no guesswork. Skip it if your engine requires a different heat range or reach.