If you are hand-starting that engine, on a log-splitter, you seem to only need a simple manual kill-switch. The kill circuit just uses the black wire from the ignition module. When the black wire is grounded, there is no ignition. When the black wire is not grounded, there is ignition. I suggest you just isolate the black wire and verify that the engine then sparks and runs. Once you've done that, decide where you want the kill switch on the log splitter, mount a switch there, ground one side of it, and run the black wire to the other side of it. No other wiring is needed, for hand-start.
