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It takes a trained eye to know for sure. It is also important how the reading is taken. When checking wide open operation--IN THE CUT--- engine should be cutoff at that time. Best to use a new plug and have someone else switch off. If this is not done, you will likely get a false reading. It's...

I totally agree with "spark plug reading" I sell a lot of saws and all are tuned to "four stroke" One has to realize that carb adjustment is critical to properly tuned two stroke ! Even changing fuel grade or oil will effect tuning, and even the age of gasoline! Here is a not so clear photo of...