This CDI spark plug connecting wire and spark plug cap here fits on to nearly any bicycle engine kit CDI Electron Ignition Coil. Perfect for replacing your standard CDI wire and spark plug cap, all you have to do is twist your stock wire and cap out of the side, align this wire with the screw in the CDI, twist, and you're ready to ride! Works with 2-stroke CDI's from Grubee, Flying Horse, Power King, and nearly any Chinese bike engine kit CDI around.