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Your mower, like most mowers, should have a Woodruff key at the end of the crank where the flywheel (pull cord) attaches. The purpose of the Woodruff key is for it to sheer off when the mower blade strikes an unmovable object. It’s possible that you only partially sheered the Woodruff key and the timing is off just enough to produce the knock you are hearing. I would at least check that before I started tearing the engine apart. Plenty of YouTube videos showing you how to replace the Woodruff key.
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Kurt V
No more Porsches, but a revolving number of motorcycles.
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