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black and green wires

What year? What diagram are you looking at? If we are talking 69-78 SOHC CB750 then green is ground, black is hot. Some wires, like the wires from the turn signals, were all black with a little colored ring at the end, such as orange, light blue, and the turn signal ground (usually just the rear) could be black but would have a little green plastic ring at the end where it connected to the harness.
 
'green is ground, black is hot' pretty much applies to all Honda bikes. A green wire with black hash is not the same as a black wire.
 
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