![]() This is because the spark is not strong enough to ignite the mixture of air and fuel properly. If the spark plug gap is off, it may lead to a rough engine running or misfiring. There are instances when the spark plug is fully functional, but the gap is causing the machine not to start. It is sometimes necessary to replace the spark plug altogether. Whenever someone asks me why their saw won’t start, I suggest checking the spark plug before anything else. Engine Won’t Start or Has Trouble Starting.However, there are some issues you will constantly encounter when the gap is incorrect. When Should Spark Plug Gaps Be Checked?Īs long as your Stihl chainsaw runs smoothly, the gap is set just right. An incorrect spark plug gap can also pose a fire hazard. In other words, if the gap is too broad or too narrow, the engine can’t run well or even won’t start. This gap is directly correlated with the efficiency of spark ignition. ![]() It then lowers the pistons and eventually starts the engine.Īs for the spark plug gap, it defines how far apart the center electrode and ground electrode are on the spark plug. The spark plug does so by creating an electrical spark in the combustion chamber, which ignites the fuel. The item is designed to ignite the mixture of air and fuel. It is a device located inside an internal combustion engine’s cylinder head. Let’s kick things off! Chainsaw Spark Plug Gap: What Is It?īefore I discuss the gap, let me explain the spark plug. I will also explain how to measure your Stihl chainsaw gap and set it correctly. I will begin the article by explaining why spark plug gaps matter. ![]() In terms of the remaining chainsaws, the gap ranges between 0.020 to 0.030. When it comes to chainsaws made by Stihl, the optimal spark plug gap is 0.020. Hence, it is vital to ensure a precise spark plug gap. If the distance between them is not accurate, the spark plug will not start the chainsaw rather it will cause misfires. You see, the plug has a center electrode and a ground electrode. Unfortunately, this device is also to blame if your saw doesn’t start. The key component to smoothly starting your Stihl chainsaw is the spark plug.
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