Another boat question

Thanks Doug, there is slight corrosion/pitting on the prop. So cavitation is possible.
I reinstalled the prop yesterday, ill take it off and investigate a little closer. The black plastic/delrin sleeve slides in/out of the prop(as it should). I was under the assumption that the delrin sleeve replaced the rubber "bushing". There may be one "deeper" in the prop?? The sleeve on mine showed very little wear or cracks/damage.
When I spoke to dealership they couldn't(or myself) get a breakdown of the prop, which they thought was weird??
Here is a video with a very similar setup to mine, altho prop is different, everything else appears the same?
Its a 90 hp mercury efi 4 stroke, s/n 1B285195.
mercury site.
Mercury Marine Parts Digital Catalog

like_A_pike said

Steve: before I had my oil canning hull welded up I would suffer from cavitation quite a lot. It’s caused by a lot of different things. Exactly the same symptoms. It’s like you have bite on the water and then it lets go. Slow down and start over and everything is fine.
Look for damaged surfaces on or ahead of the propeller or change the pitch of your outboard even…

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