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How many wires to the starter button in the switch Ted
The problem Ted is your trying to marry up 550 switchgear with a 500 loom and that's not going to be a doddle.First of all the yellow/red is supposed to be earthed by the starter button on the 500, on the 550 it's a different arrangement as the 550 has a clutch switch and sensor so the starter solenoid won't work if the bikes not in neutral or the clutch isn't pulled in. You haven't got the wiring for that. On the 550 the yellow/red connects to a green/red when the button is pressed.You also seem to have a yellow/black connected to 2 blacks for some reason, yet there is a female yellow/black up near the top connected to something else, what's that about. What does the black/blue wire connect to in the switchgear? I have a sneaky idea that's the power source for the headlight flasher and horn, try testing to see if there is continuity between the blue and the black/blue when the pass switch is operated and also light green to black/blue when the horn is pressed If so that wire goes to the black connectors in the loom..
You have my number if you are sat in front of it scratching whatever you scratch