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DannoXYZ : I have no oscilloscope. I can borrow a compression tester from a local auto parts store that loans them out but I'd have to see if they offer them with a small enough adapter/fitting for the plug hole.
I plan to do the sync today and hope that works out. I'm going to skip the compression test because, practically speaking, if it does happens to have some valve/ring issues I'm not willing to dive in that deep nor shell out any money for the work. Thanks for the diagnostic tips, I truly appreciate all the help here from the forum members.