My ER-6n had the same issue... All ready to ride, and me and a friend are looking at each other like "what now?"
I cheated. We were 5 minutes from the dealer I bought it at, they were open, and the bike was under warranty. They dosed it liberally with WD-40 to unstick it, then recommended I lube it occasionally with something a bit more permanent such as lithium grease. Which I hit it with occasionally. I suspect a decent chain wax would work, as well.
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