Generally, use a 13/16-inch spark plug socket for Honda lawn mower spark plugs. Some older or smaller engines may require a 5/8-inch socket. Always verify with your model’s manual or measure the plug hex to be sure.
Common socket sizes for Honda mowers
The spark plug hex size varies by engine family and plug type used by Honda. The sizes you are most likely to encounter are listed below.
- 13/16 inch (approximately 20.6 mm) spark plug socket — the most common size for many Honda small engines.
- 5/8 inch (approximately 16 mm) spark plug socket — used on some older or entry-level models.
In practice, 13/16" is the default for many Honda walk-behind mowers, but some models may require 5/8" depending on the plug type. If in doubt, measure the plug’s hex or consult the owner’s manual for your exact model.
How to determine the correct size for your model
To ensure you are using the right socket, follow these steps:
- Identify your mower’s engine model (for example, Honda GX-series or the G-series used in walk-behind mowers).
- Find the spark plug type recommended by Honda for that engine (for instance CR6HSA, BPR5ES, etc.).
- Inspect the spark plug hex size by looking at the flats on the plug or measuring across flats with a caliper or ruler.
- Check the spark plug socket included in your toolkit or the one recommended by the manual; the socket size is usually printed on the socket itself.
- If you’re still unsure, consult the mower’s service manual or contact Honda support for confirmation.
Concluding: Using the correct size socket makes removing and reinstalling the plug easier and reduces the risk of damaging the plug or the socket.
Using the socket properly
Once you have the right size socket, follow these tips to avoid damage and ensure a proper seal when reinstalling the plug:
Torque and installation guidelines
Use a torque wrench and tighten to the manufacturer’s specification for the spark plug in your engine. Avoid cross-threading, and replace any washers or gaskets as recommended. If the manual specifies anti-seize, apply it sparingly and only to the threads that require it.
In summary: For most Honda mowers, a 13/16" spark plug socket is the standard size, but some models may use 5/8". Always verify with your engine model and plug type, measure the hex if needed, and torque the plug to the recommended specification when reinstalling.
Summary
Most Honda mower spark plugs require a 13/16-inch socket, though a 5/8-inch socket is possible on some older or simpler models. Always confirm by checking your engine model and plug type, or measure the hex across flats on the plug. Use the correct torque when reinstalling and consult the manual or Honda support if you’re unsure.