I have a JDx300 I bypassed the RIO by putting in 2 wires to act as a jump. This way I can go forward/reverse instantly and get off the seat w/ out the mower shutting off or without having to push or hold another button. If it is related to that this may help, query it on YouTube and there is a simple step by step on how to do it. How many hours on your JD?
Walker 48" MTGHS
Husqvarna & Echo