-- Yes, the counterweights are polished to reduce the amount of oil sticking to the crank, and also to help it cut thru the air/oil mist better. Whether this actually works, I am skeptical to be honest, but it seems to be a common feature of all aftermarket crank work. With Falicon, its just part of their Supercrank spec.
-- Most all modern motorcycle cranks are the plain bearing type. There are still a few that use roller big ends and mains, like F model dirtbikes, and some that are a hybrid like Ducati, which use plain big ends, and roller mains.
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