Intermittent spark would not be a bulb issue (either your bulb is blown or it isn't, so either you have spark or you don't). Like Lar siad, It's most likely points. If not points then try condenser, and then ultimately coil. They typically go in that order from most to least likely. Coils don't really burn out unless they're rusted out. Of the 30+ mopeds I've had, only one had a coil issue (and that was because it had sat outside for 2+ years) but probably 1/4 of them needed points cleaned after I got them. When a condenser starts going bad it'll give you spark until it overheats after the first couple of miles (if you let it cool for a bit it'll start working again).
Re: Won't start, intermittent spark now none
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