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I'm on vacation, so I don't have my spread sheets or other data sources. But by memory, isn't the neo-Bonnie closer to 500#, meaning at least 50-70# heavier than the W?
Actually Kawasaki just bought a chunk of Meguro and rebadged the 650 as a Kawasaki . Not an exact copy of a BSA , although they certainly were similar . Kind of like a Rikuo was almost a Harley :D Dusty