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You've definitely got a "ticking sound" there, although I would say it's more of a "clatter". Good job on the videos, often people post cell phone videos that are so bad you can't hear the noise they're talking about.
It sounds like something's up with the engine's Cam Chain. In the video it sounds like the Cam Chain isn't being properly tensioned which means it will lash when the engine RPMs decelerate. When you rev the engine the Cam Chain gets pulled into an smooth, organized form, but when the engine slows it sends a shock through the Cam Chain and it gets disorganized and lashes for a while, then slowly smoothes back out.
I think your first troubleshooting step should be to remove, clean, re-grease and properly re-install the Cam Chain Tensioner (following the Service Manual, base manual, procedure Chapter 4, pages 4-7 to 4-8, instead of just guessing at how the thing is supposed to be handled).
It could be as simple as a tensioner thats not doing its job.
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