the ICU-L ignition V2.0 has two battery test modes. In either mode The ignition switches off when the prop is turned the wrong way. Programming switches between long and short silencer mode and vice versa. This ignition can switch between short muffler (side, pitts) and long muffler (canister, tuned pipe)
Mode 1: With the jumper on (closes) the rightmost pins, battery test is enabled,
Mode 2: With the jumper off (open) battery test is disabled.

re-programming sequence: (switch silencer type)
power on ignition, and let ignition enter sleep mode.
now unplug jumper (mode 1) or plug in jumper (mode 2)
wait about three seconds, until the led flashing changes to a one second rithm. Short led on is short silencer (shorter on than off), long led on is long silencer.
Power off ignition
With power off, reset the jumper to the desired battery test mode (mode one is closed, mode two is open)

edit: To make sure you get the switching system:
If now the ignition is in the wrong muffler type, repeat the sequence, and it will swith to the other type muffler.

I hope this helps.