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take the sheared pin to the machine shop, they can test to see what it is made of, and make a few for you.
I know trolling motor pins are SS
or order them from e bay since you say you can find them on there
the light tells you when the spark is happening.
idle timing is usually ATDC (after top dead center) it should advance to BTDC( before top dead center) to be able to burn the extra fuel at higher RPM
there is a reason they give you the specs in the service manual( so you can check it)
No fuel should be flowing thru the main jet into the motor during idle.
as I said check to make sure the timing is advanceing as the extra fuel starts hitting the motor.
or just tak it into a shop to let them fix it
I have never worked on a Suzuki, so no help on wires.
but see if you can find a service manual with wiring diagrams for your motor.
trace the wire from ignition switch to the start relay.
find out where you get 12+ to and where it stops