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Yes, I've tried that. Yesterday, I had a chance to investigate the carb. After removing it, I went through it and found no issues. All the gaskets and diaphragms were supple. I would have vacuum/pressure tested it, but I had cleaned and organized my shed a couple months ago. You know what that means...I couldn't find my tester until after I had run out of time! Eventually I remembered where it got stashed, and I will do more testing today. I'm more convinced that I've got an air leak, as the saw has become very hard to start and refuses to idle at all. Time will tell... Thanks for your input. O