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My '15 yz250fx has developed what I thought was a valve tap from being out of adjustment, however I checked and reshimmed to make sure everything was in spec and all is good. Put back together and still there. What else would cause this tapping noise? I will post a video for a better diagnosis.

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Did you check the motor mounts/pipe shields for a loose bolt?

Did you happen to look at the cam bearings or Auto decomp while it was apart?
Unrelated, how many valves and how much did you have to change the shim size?

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Cam chain whip.  How many hours on that engine?  You might try changing the cam chain.

And while you're at it, change the oil and oil filter, and you might check the oil pump.  If the chain is whipping into the sides of the cylinder, you will get aluminum chips in the oil.

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