[DaveO430]

Unless you isolate the solenoid from the frame the green/red wire is useless. You should have gotten the marine relay.

 

[DaveO430]

The two smaller terminals are for the internal coil. You should connect the yellow/red and green/red to these terminals. If you don't connect the green/red to one of these, you will have to use the clutch lever every time you want to start the bike - the ground through the neutral switch will not work.

The green/red is the same wire for both the clutch switch and the neutral switch, if not connected to one of the small terminals on the isolated base solenoid (or in the case of the ford solenoid if isolated) neither will work.

 

[DaveO430]

That marine solenoid does have an "I" printed on it, which to my understanding is just used to send a full 12 volts to the coil during starter cranking. I do not want to connect a ground to that circuit. I've extensively googled that "I" terminal and have never read that it is connected to a safety ground. It is always identified as going to the ignition coil, and carrying a full 12v. Hence the "I" label. Maybe other solenoids have different connections, but then they must also be labeled different.
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I did some research and found the marine relay has an isolated base, therefore uses both terminals in the starting circuit, that's why I suggested it. Outboards have a neutral safety and my assumption is it grounds the relay just like on motorcycles.

 

[DaveO430]

As Dave said there are marine starter relays with isolated mounts.
There are also lots of lawn and garden tractor starter relays with isolated mounts.

Why the Ford relay with grounded mount became the go to replacement is strange.

I suppose because you can buy one anywhere.