300/440/550 Js550 no spark

OK, this is really stumping me. So wayy back at the 4 of July weekend, my ski was running fine. But it cut out on spark. A few hours later, it would regain spark. But only for like an hour.

So after this whole situation with my jet ski having bad timing, I knew that the coils were on wrong. I tried everything I could and got bad timing. But sine the ting was off. I knew something was wrong with the coils, so removed them and put the old ones on. Fired right up. Until the next morning then it had no spark. So what can I do to fix this. Can I clean them?

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