I have never seen the air solinoid removed on any bike. This doesn't mean it can't be done, just that I have never seen it.

I have had bikes from stock street (with everything in place) to race prepped bikes (not prepped by me). All my bikes have had that part there, and plugged in.

Maybe someone else can answer what this does, and what will happen if the part isn't there.

thanks,
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Charles Gallant