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

• NCY 0900-1076 Performance CDI without Rev limiter for the Ruckus 50

NCY 0900-1076 Performance CDI without Rev limiter for the Ruckus 50NCY