The spark plug gap should never exceed.055 ” unless pre-set by the manufacturer. Most Brisk and other manufacturer sparkplugs are preset to around 0.75mm – 0.8mm. If your spark plug part number has no trailing digits then (for most part numbers) it will be preset to this specification.
This begs the question “How do I know if my spark plug gap is too wide?”
If the tool passes through the gap without touching the electrodes at the appropriate measure , your gap is too wide. If you can’t fit it between the electrodes, the gap is too small and needs to be widened some. If it fits closely to the specified measurement, you’re safe to install the spark plug.
These figures are for guidance only and may vary on certain engines. Consult recommendation list or vehicle manufacturer’s handbook for individual gap settings. The rule of thumb for the spark plug gap on older engines is coil ignition 0.025 thou and magneto ignition 0.018 – 0.020 thou.
What is the spark plug gap and why is it important?
Spark Plug Gap setting is important for proper engine operation . To set the spark plug gap correctly, you need to use a spark plug gap tool. For reference, see our spark plug gap chart below, this chart converts metric measurements to standard.
The gap adjustment can be fairly critical, and if it is maladjusted the engine may run badly, or not at all. A narrow gap may give too small and weak a spark to effectively ignite the fuel-air mixture , while a gap that is too wide might prevent a spark from firing at all.
This begs the query “Do NGK spark plugs need to be gapped?”
A spark plug part number might fit hundreds of different engines from many different manufacturers. Although the NGK factory will set the gap to a preselected setting, this may not be the right gap for your particular engine .
How do you set the gap on a spark plug?
You can adjust the spark plug gap if it was not set correctly . To increase the gap, gently bend the ground electrode towards the center electrode. To do this, use either a pair of needle nose pliers or a dedicated spark plug gapping tool.
One more inquiry we ran across in our research was “How do you reduce the gap between spark plugs?”.
Here is what we learned. Tip: To decrease the spark plug gap, you can use the tools mentioned above , or you can push the ground electrode against a soft surface, such as a wooden table. Note: Be careful when bending the ground electrode and never adjust it more than .02 in. At a time. Step 5: Re-measure the gap.
The gap should be adjusted by only moving the ground electrode . Another consideration that should be taken into account is the extent of any modifications that you may have made to the engine.
How do you adjust the spark plugs?
When you hold the spark plug with the electrodes facing the floor, you’ll want to bend the bottom one very gently either in toward the other electrode if you want to narrow the gap, or out, if you want to increase the gap slightly . Never bend more than a few (.02) fractions of an inch. It won’t take much pressure, so be very careful.
Then, how do you adjust spark plugs on a lawn mower?
Adjust them accordingly. Use the tool to adjust the bottom electrode. When you hold the spark plug with the electrodes facing the floor , you’ll want to bend the bottom one very gently either in toward the other electrode if you want to narrow the gap, or out, if you want to increase the gap slightly.
Can you use a coin style gap tool to adjust spark plugs?
Of these three using the coin style gap tool is not recommended because it can easily damage electrodes and break the tips of fine wire spark plugs. A few notes before adjusting your spark plug gap. First of all do not attempt to adjust the gap on used spark plugs, only adjust new spark plug.