My kymco super 8 headlights go out when you open the trottle and come back on when the bike is idling

As far as the Lights going out when throttle is applied, that indicates something at the LCM. At idle, the CDI sends a signal to the LCM which switches to a lower voltage line, which dims the bulb from the higher voltage line (to be clear, that are both 12 volt lines but I am simplifying it). The "higher" voltage line is getting no power if your lights turn off when the LCM switches to it. I found I had to apply significant pressure and slightly bend metal tabs to get a better connection to fix the problem. I diagnosed by pushing the lines in on the LCM (mounted upside down and wrapped in a large rubber band). By pushing in while revving the engine, the lights would flicker on (and back off when I released the pressure). After 300 miles the problem repeated for me so I took it apart again and tried to pull the wires through a little more... Still pending effectiveness. As far as the Lights going out when throttle is applied, that indicates something at the LCM. At idle, the CDI sends a signal to the LCM which switches to a lower voltage line, which dims the bulb from the higher voltage line (to be clear, that are both 12 volt lines but I am simplifying it). The "higher" voltage line is getting no power if your lights turn off when the LCM switches to it. I found I had to apply significant pressure and slightly bend metal tabs to get a better connection to fix the problem. I diagnosed by pushing the lines in on the LCM (mounted upside down and wrapped in a large rubber band). By pushing in while revving the engine, the lights would flicker on (and back off when I released the pressure). After 300 miles the problem repeated for me so I took it apart again and tried to pull the wires through a little more... Still pending effectiveness.

All my connections are now secure but my lights would occasionally turn off suddenly when at top speed. The lights turn back on at idle. Basically it was working on the 6 volt signal and stopped working on the 12 volt signal. This is the CDI. Turn off the engine and turn it back on to reset the CDI and the headlights should return to normal function. I found it only happens when holding the throttle fully open while at top speed. It is a glitch with the built in limiter in the CDI. New CDI's do the same thing but I have read that some don't so it sounds like a quality control problem from Kymco. The cheapest fix is to back off from full throttle once you get to top speed. If your lights do go off while moving at night, turn on your blinker to see something of the road and turn the key switch of and back on. The headlights should work once you reset the CDI. All my connections are now secure but my lights would occasionally turn off suddenly when at top speed. The lights turn back on at idle. Basically it was working on the 6 volt signal and stopped working on the 12 volt signal. This is the CDI. Turn off the engine and turn it back on to reset the CDI and the headlights should return to normal function. I found it only happens when holding the throttle fully open while at top speed. It is a glitch with the built in limiter in the CDI. New CDI's do the same thing but I have read that some don't so it sounds like a quality control problem from Kymco. The cheapest fix is to back off from full throttle once you get to top speed. If your lights do go off while moving at night, turn on your blinker to see something of the road and turn the key switch of and back on. The headlights should work once you reset the CDI.