Switches are not the same, momentary only allows power through the switch when you press it, this will earth out the magneto. With coil ignition you require constant power through the switch till you turn it off to kill power to the coil. For a magneto you require a N/O switch, for coil ignition you require a N/C switch
The Harley switch you put up is a N/C switch for coil ignition, not a magneto

Last edited by NormK; 06/01/25 08:20 PM.