If a Yamaha 350 big bear has no spark and everything is tested is okay could it still be cdi box?

If a Yamaha 350 big bear has no spark and everything is tested is okay could it still be cdi box?
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.