Re: 52 F1 solenoid
solenoid grounds through the base to cowl. On a 4 pole solenoid one of the small post goes to the starter button the other is a momentary straight 6v to the coil. I haven't seen a metal version like you have. Pretty neat.
The red wire going from the mount bolt to a ground isn't really needed, but I bet it works well. Take the solenoid off and clean a little paint off the the cowl and add a washer to assure a little more surface contact. Then you can remove the wire (if your bat 2 body is solid).
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