I have a o7 49cc hyosung..new battery..no power when I turn key on..no lights at all..help

Try looking at the ignition fuses, could also be a bad earth to the starter motor. When you turn the key do the lights dim at all,

1. is the battery connected?
2. negative to negative positive to positive.
3. fusible link?
those are a start

Have you checked your fuses?

Check to see that power is going into the switch and that power is getting out of the switch. Chances are the switch has gone bad.

Check your fuses and make sure your battery cables are tight and clean.

flat battery,,, try charging it up,,,il give you a free tip,,,
if your going to stand the bike up for a long time,,
ie:weeks, then buy yourself a solar charger of 12 volts @ 2,4 watts and hook that up to your battery when you leave the bike, it will keep the battery toped up,, and all the solar sell needs to work is day light,, sun light is far better but good light will do,,,
free power,, i use them on all my bikes, no flat batterys so far,,,in 3 years!

are you sure the clicking is comeing from the coil it sounds to me like a sticking starter soloniod try tapping the starter soloniod &starter with a light hamer this will quite often free it up do this while operating the starter button if this does work I would be replaceing the starter soloniod ASAP you might also want to check the voltage regulater & all the earths on the machine

check the start solenoid voltage, starter side, key on, run switch on, start switch pressed. have volts - check same at starter where wire attaches.

Bad hot wire, bad cround or bad starter. Use jumper cables to jump from battery directly to the starter. If it doesn't turn over the starter has a problem. If it does, than you have eather a bad ground or hot lead going to the starter. Use a DC volt meter or a test light to see if its got power coming from the starter button. Do all that and you'll know the answer.