Ah, so if the firing isn't on, then if delayed or weak, there won't be sufficient cumbustion force to push the piston as intended, thus putting abnormal forces on the rest of the crank assembly, starting with the bearings...?

As for the HB, I was thinking about how the one I have has shallow drill impressions, like you'd have if it was balanced. Didn't know the part about the resonance.

Good stuff, as always!

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