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2017 Seadoo Spark 90hp with IBR runs well except when at WOT. This is a new problem on pwc owned since new. About 70 hours on engine.

If run just below WOT there are no issues. From stop, or while cruising, if you go WOT the engine bogs down just a bit and then a few seconds later resumes full speed. Every 3-5 seconds you get a surge of power, then 3-5 of low power.

First thing checked was wear ring. It was cracked, so I replaced it. Impeller still looked pristine. Overall performance was better, but still had surging issue.

Things I will check are plugs, fuel pump, fuel filter, wear ring (again). Any other thoughts of where to look? Season is coming to close here, so not very many more days to try things and see if it fixed it.
 

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I had same issue. I replaced the fuel filter and plugs and it ran like new. The fuel filter was spotted black so I am quite sure it had some fuel blockage. Your wear ring is fine.
 
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