Razor MX500 & MX650 6-Pin Throttle and Controller Kit Razor MX500, MX650 and Ecosmart 36 Volt Throttle and Controller Kit COMPATIBLE WITH: ALL Versions of the MX500 Dirt Rocket, MX650 Dirt Rocket and EcoSmart Scooter INCLUDES: Razor 36 Volt Twist Throttle and 36 Volt Controller REPLACES : Older 4-wire or 5-wire throttle or controller.