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I would replace stator. I have had this problem twice on my big bear, I checked everything and even replaced coil and cdi box and it was the stator both times. First i had weak spark and replaced it and the second time i had no spark. I would look on ebay, they are usually about $140 dollars. Also make sure u get a new gasket.
First check for ground with your OHM meter. From one pin on the stator to ground. Nest check the other pin. If you have a ground, or any OHMs, its bad. For more detailed information, please see the related link below.
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70