I had same prob (electrical) with my son's china ped....
Remove ignition switch dismantle and clean contacts, will almost certainly be green. The bike will still "start" and run as the ignition contacts in the switch have to be seperate for the bike to run.
check also tappet clearances (if 4 stroke) as most chinese bikes suffer from valve seat recession closing the gap and thus they may start, but run rough and not idle. Cleaning carb jets is always a must when a bike has been standing for a long period.
Chinese motorcycles Enjoy
By the way ther have been 5 of them gracing my household over the last couple of years.........................
HTH Terry