NCY 0900-1076 Performance CDI without Rev limiter for the Ruckus 50 Does not work with EFI systems. All USA Ruckus models are non EFI Purchase at your own risk if you have an EFI system. CDI advances ignition timing Removes the factory rev-limiter This Upgrade is ESSENTIAL to unleashing all the potential power from your Ruckus See Dyno chart image for chart