Should have only one wire like Scrubcadet10 said. The stacked plate device in the left side of the picture is the magneto. That black wire is what you need to trace down. If your GROUND that wire to the mower body, the engine will NOT start or run. That is the ignition kill wire.
The stop switch location can be ignored on a riding mower. The below pic looks to be from a push mower engine.
slomo
The stop switch location can be ignored on a riding mower. The below pic looks to be from a push mower engine.
slomo