Simple answer is it sucked up some weeds and the transmission oil cooler is clogged. Easy fix, and something a person should do as preventive maintenance a couple times a season.
And yes, you can start a boat out of water and not see any immediate issues, but this will catch up with you with shortened impeller life and potentially an overheated boat on the water.
Two 14" 5 lug S5 wheels with ST205/75R14 Kenda Loadstar radials $349
Two 14" 5 lug S5 wheels with ST215/75R14 Kenda Loadstar radials $389
Two 15" 5 lug S5 wheels with ST205/75R15 Kenda Loadstar radials $409
Mounted, balanced and delivered.
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CARBURETOR REBUILDING - $199
Parts, labor and return shipping included
2 LED 6" BRAKE LIGHTS DELIVERED $32