If yours has a safety unit, you can bypass it by tying the spare green wire (under the left side cover) to the green/red on the start solenoid. Then you can unplug the box.
The safety unit circuit works simply like this: if you are in Neutral or if you pull in the clutch, it lights up a little light bulbs inside the safety box that faces a photocell: this photocell then turns on a transistor to the green wire to tie it to the start solenoid's green-red wire. So, you can just bypass the transistor with a connection yourself.
The controversy over the insanity of this module, when the light bulb burns out and leaves you in the intersection at rush hour with a stalled bike that won't start, led Honda to change the entire wiring harness in the 1975 bikes. Then they used a simple diode instead. That should be bypassed, too, as when it burns open due to an electrical tech accident, the same trouble you now have shows up again.
If you just remember to either have it in neutral or pull in the clutch yourself, you don't need assistance? I sometimes wonder how the millions of motorcyclists survived before this thing started in 1973, forced upon the motorcycle world by president Carter's DOT...
