Do you need a spark plug gap tool?
You need a feeler gauge to gap your spark plugs properly. Gap new as well as old spark plugs, even if the package says that the new plugs are “pre-gapped.” To avoid problems, work on only one plug at a time, in cylinder sequence order.
Consequently, what is the correct spark plug gap for lawn mowers?
Setting the Gap on Your Spark Plug
You'll need a spark plug gauge to adjust the gap on your lawn mower's spark plug. Although many small engine spark plugs require a .030 gap, this varies depending on the engine type. You can check this on the engine owners manual.
Then, how do you use a spark plug gap tool?
What happens if spark plug gap is wrong?
Incorrectly gapped spark plugs could cause engine misfires. Corroded spark plugs could halt the spark altogether and, again, cause misfires. Broken spark plugs could, you guessed it, cause misfires AND if pieces of the ceramic enter the cylinder, could cause far worse issues down the road.If the spark plug gap is incorrectly set, it can lead to engine issues. ... Too small of a gap may give too weak of a spark to complete the combustion process within the engine; too wide of a gap can lead to the spark plug not firing correctly, causing misfires at high speeds.Here's How to Know if a Lawn Mower Spark Plug is Bad
- You can't get the engine to fire up at all.
- You have to tug extra hard for longer than usual on the rewind.
- Your lawn mower loses power while moving.
- The gas runs out quicker than it used to.