This is an amazing app for every man or women that wants the best performance out of their small engine. This app will tell you the size of a gap you need on your spark plug for small engines such as chainsaws, trimmers, push mowers, ride mowers, general gas engines, and even golf carts. This app even tells you the spark plug part name and number that you need.-This app is also ad FREE and won’t take up hardly any space on your mobile device.-Tags: spark plug gap app, spark plug, spark plug gap chart, spark plug gapping, spark plug gap size.