It might be worth having it loked at by a mechanic. Otherwise try to inspect the impeller and wear ring for damage or wear.
I bought a 20 year old seadoo a few years ago in late fall. It started and ran great but I wasn't able to take it on a test drive. When I got it on the water the following spring, I discovered it had no power. After some research I suspected the wear ring. Sure enough the impeller had a few dings in it and I could just about stick my finger through the gap between the impeller and wear ring. The ring also had a few gouges in it. After watching a couple of YouTube videos I replaced it myself along with filing down the edges on the impeller. Replacing was a bit tricky but easy. Cost was about $60.
Runs like new.
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