If your chainsaw is not running properly, it could be due to a bad spark plug. If your chainsaw is not running right and the electrodes look fine, try replacing the spark plug first because that’s normally all it takes! Bad spark plugs in chainsaws can be a common problem, and it’s important to know what causes them so you can prevent it from happening.
If the fuel checks out and your engine starts but runs rough, a bad spark plug is likely the culprit. If you suspect your spark plug has failed internally, use a spark plug checker to find out. Refer to your machine’s owner’s manual to find out what the spark plug gap should be, then use a spark plug gap tool to measure your plug and adjust the gap, if needed.
Although a spark plug tester only tells you whether the spark is actually reaching the cylinder, it will tell you immediately whether the spark plug is the cause. You remove the spark plug and insert the spark plug tester into the spark plug opening in the cylinder head. Some may have a boot that fits onto the plug – these are better. These plugs are also more durable than copper-nickel plugs and can often last as long as platinum spark plugs.
A spark plug is the component that provides the spark and is absolutely essential in gas-powered chainsaws. Spark plugs are cheap! Regular change-out protects your engine from the stress of operating with inefficient spark plugs. Prolonged use of a chainsaw with bad spark plugs makes it inefficient, difficult to use, can damage the engine and also negatively impact the environment.