Not familiar with shifter karts but I’m guessing the engine does not present any electrical or mechanical indication for neutral. If the shift linkage stops at a fixed position for neutral, a position sensor like a throttle pedal sensor could work. I’d check with AiM.
I had difficulties with a bike finding neutral. Coasting the last few feet to a stop light made it easier to find neutral while moving slowly.
LAD Specialties customer / tony kart / rotax / kt100