I hear that a lot, but don't believe it. The carb is a fixed fuel/air mixing device. Changes to the engine don't change the mixture. Slight changes to the mixture help get best performance at specific rpms. I think a muffler mod simply helps a person to hear if the saw is really tuned right to...
I think a lot of it depends on the particular saw and how it has been run, along with the weather conditions. The best practice is not only learn how to keep your saw's carb properly adjusted, but learn how best to start it. For a 2511T I find it starts best either with the choke set to full...
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