![]() ![]() Pick the one that matches the recommended plug gap. A feeler gauge is comprised of wires that vary in thickness. There are three ways to measure it, with a feeler gauge, wire gap or coin gap.įeeler gauge. Once you have the exact gap, it is time to measure it. You will find either an online manual or technical specifications including the spark plug gap. Go to the manufacturer website and look for your lawn mower make and model. Depending on the lawn mower, the gap may be different.Īside from the manual, you can find the spark plug gap online. ![]() It is best to check the manual to be sure. As stated earlier this is usually 0.02 to 0.30 inches. Look in your lawn mower manual for the suggested gap. A wire gap, coin gap or feeler gauge (our pick is the PQY Universal Spark Plug Gap Tool ).Whether you want to double check the gap on your new mower or installing a spark plug, the following instructions will work. How to Gap Lawn Mower Spark Plugs Step by Step It works with the Craftsman M105 140cc and other mowers. The following steps show you how to do this. Assuming that the plugs are properly installed, it is still a good idea to know how to measure the gap for future spark plug installations. If the engine is not starting or consumes fuel rapidly, there could a spark plug problem.Įven if the manufacturer states the spark plug is gapped, situations might cause it to misalign. If you bought an old mower there is the chance its spark plugs are not gapped. And if you need to install a new plug you will have to set the gap properly. Most lawn mower manufacturers’ pre-gap the spark plugs and you can check the owner’s manual to confirm this.Įven if the brand is reputable, you should inspect it. Just like solenoids, you have to make certain it is installed properly. Spark plugs play an important role in lawn mowers. You can use a feeler gauge to measure this. The spark plug gap for mowers should be 0.02 to 0.30 inches. Majority of lawn mower spark plugs are pre-gapped, but it is a good idea to check it yourself. As you will see, the process is really simple. If you are going to install a new spark plug, this post will show you how it is done. The gap has to be a specific length, otherwise the mower might not work. The spark plug gap determines the heat range that the spark will generate to ignite the fuel. As an Amazon Associate, this site earns commissions from qualifying purchases. ![]()
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