very informative thread right there - thank you, superyota - that one didn't come up while searching...I bet all the new guys say this.
My first reaction after watching that video is that mine sounds pretty similar, but its hard to tell from a video. I did get a new gasket kit, but only used the squish washers since my gasket still looked pretty good. However, now that I know that could be the cause, I will swap it out
I'll also look for grooved and worn adjusting screws.
As far as the correct lash - i've seen recommendations all over the place. .006&.008, .006&.009, .007&.010, .007&.011, .008&.012 not to mention the whole operating temp or cold issue. Is there really a "correct" lash or are there too many variables and I need to just play with it and see what works best for my motor?
i'll post up what I find once i swap out the valve cover gasket.