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This one is the old standard Stihl 271 Farm Boss. The flywheel is original and I am waiting on an OEM Stihl module. I have precisely changed gap settings with no difference noted. The replacement after-market module is suspect, but I never heard of a way to accurately test a flywheel except...

Aside from a sheared key or visible damage, is there any way to test a flywheel on a Stihl saw other than it having a strong attraction to a screwdriver? It would seem a flywheel is essentially bullet proof if properly installed. I am having spark issues and have done all the seemingly...