Mine smokes a bit when you really romp on the throttle. Not really concerned about it.
Not sure if you've kept up with the "DV as a source of nailing" thread, but the nailing (LOUD) in mine was solved by isolating the problem cylinder (Cylinder 4 in my case) and swapping in a new DV. It'll clatter a bit when cold (multiple cylinders), but after about 90-120 seconds of runtime, it quietens right down.
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