![]() Typical spark plug gap for a four-stroke engine is about. A gap that’s too small, on the other hand, could cause a weak or no spark, constant plug fouling, no starts, temperamental starting, flooding, and the list goes on. It is important as it is paired with the engine’s electrical system.Ī gap that’s too big may cause misfiring and premature coil failure. As we said earlier, each plug type has a particular gap size. The wider the gap, the stronger the spark and the harder the coil has to work to jump the gap. Gapping the plug is, as its name suggests, checking the gap in the electrode. But before fitting, it makes sense to check and adjust the gap. To nail this successfully, a helper and a new spark plug are advised. Insulated pliers (plastic coated handle).You’ll need a few basic tools, they include: In this section, I will show you how I test for spark, both with and without a spark test tool. You can find the test tool I use here on the “ Small engine tools page.” Diagnosing Snow Blower No Spark ![]() In a test situation, this is exactly what we want. I recommend using a spark test tool the tool does a better job than a spark plug as it stresses the coil/armature, which causes it to work extra hard to fire the tool. Viewing the plug while yanking on the cord can be tricky, and you know, if the plug doesn’t ground, it won’t spark. I know you tested the spark plug and found no spark, but it’s worth noting testing for a spark without a test tool is sometimes hit-and-miss, especially if you are testing solo. ![]()
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