Because the Ninja has only one turn signal indicator on the dash, that bulb is actually part of the turn signal circuit, and current flows through in different directions when the left and right signals are activated. Therefore, the system won’t work with LED turn signals. You need to install diodes in the system.
Something like this:
https://youtu.be/7_6aXFOl4eE?si=S3yUn4wH0-JXYA6C