Did you put more oil in it?
I found out the hard way when I overfilled my oil(4-stroke) and had the same issue.The oil fouled the plugs.duh.You did say you checked the plugs so probably not the problem.Most newer pwc's have 2-3 speed level settings but this does not sound like that.I would not suspect bad gas so soon either.I would look at the fuel filter AND water separator.
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SIKSUKR
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