Honda 98079-56846 Spark Plug for Walk-Behind Mowers

What It Is

The Honda 98079-56846 is a genuine OEM spark plug designed for Honda GCV and GXV series engines found in walk-behind mowers, pressure washers, and generators. It delivers the consistent spark needed for reliable starting and efficient combustion.

Fitment & Compatibility

Before buying, confirm your engine model. This plug fits Honda GCV135, GCV160, GCV190, GXV160, and GXV190 engines. Check the engine label (usually stamped on the blower housing or valve cover) for the exact model number. It replaces Honda part 98079-56846 and cross-references to NGK BPR6ES. The plug has a 14mm thread diameter, 19mm reach, and a 5/8″ hex size. It is not compatible with older Honda engines using 12mm plugs or with non-Honda engines unless they spec the same NGK equivalent. If your mower uses a resistor plug, this is a direct match.

Key Things to Buy

• Genuine quality: Honda OEM ensures correct heat range and electrode gap (0.028-0.031″). Aftermarket plugs may vary, causing misfires or hard starting.
• Easy install: Gapping is pre-set but always verify with a feeler gauge. Use a torque wrench (18-20 ft-lb) to avoid overtightening and stripping the aluminum head.
• Common gotcha: If your mower runs rough, check the plug cap wire for corrosion before replacing the plug. Also, don’t use anti-seize on the threads—Honda plugs have a plated shell that prevents galling.
• Shelf life: Plugs degrade over time. If the plug is more than 2 years old, replace it even if it looks clean.

Should You Buy It

If you own a Honda GCV or GXV walk-behind mower and want reliable starts, smooth idle, and full power, this plug is a no-brainer at $6.64. It’s the exact part the engine was designed for, so you skip guesswork. Avoid it only if you’re running a non-Honda engine or an older model that requires a different heat range.