Should be a set up available off the chinese copies. Carry a spare cdi if it worries you, they seem to last about 16 to 18 years with moderate riding, but they can go out. Usually
the bike will display symptoms first though, harder starting, missing like it's lean when cold and you try and add throttle, bucking like a bad condenser is probably the most common.
A lot of guys chase it like a carb problem.