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errrrr, as far as i can tell the only question the OP asked was ' what do you think of my CB650 build ? ' and incidentally, nice bike and i reckon stick with the custom seat, there are more than enough stock looking bikes around here
Details on the 400 gearbox? I haven't heard about that mod before.
You have already stated you know more than we do, so how could we possibly offer any advice? (Other than proper forum manners.)