No spark

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Hellow,I hope you can shed some light on my problem i am having.I have a 49cc 4 stroke miny chooper ok.The problem is it was running just fine until i shut it off one day after i was ridding it now it won't start at all.The motor turns over just fine with the starter but i am not getting any fire to spark plug at all.I check the coil and its getting no fire to it.What could be the problem? Roy