36V Controller and Throttle Compatible with Razor MX500 MX650 Dirt Bike, Control Module and Twist Throttle Handlebar Grips Replacement for Razor SX500 Electric Dirt Rocket Quad EcoSmart Parts

My kids quad behaved the same when we burnt the controller up. Knew it would happen as we had over plates to 36v and was already waiting on new controller to arrive. Only took a couple days for the stock controller to burn up. Controllers are easy to find. We used this one but it has no reverse and had to wire in a power button and swap one connector for a different connector for the battery. https://www.amazon.com/dp/B0DDPLTBSG?ref_=pe_123509780_1038749300_t_fed_asin_title This one also didn't fit where the stock one did so we had to zip tie it into place.