A tach is just a tool or aid that should not substitute proper knowledge of tuning. Relying solely on a tach is kinda foolish. Tachs don't seize saws, people and other factors do.
I pulled the muffler and it isn't seized but will not rotate past TDC. There were some ferrous nail clippings on top of the piston I can only assume ring fragments. The cylinder wall has a spider Web pattern on it. This saw doesn't seem worth a cylinder replacement to me being a glorified Poulan but what the heck do I know. Thanks for the info everyone you folks are a source of knowledge and inspiration
Well I pulled the cylinder and everything looks fine and the ring is intact. Not sure where the metal came from. A shop looked at it before me and said it wasn't worth fixing and advised buying a new saw. Perhaps they accidentally dropped something in there? I guess I will put it back together and see how it goes.
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