Could be something as simple as s fouled propeller, to something more significant. Start with a quick snorkel & take a look at the prop. Have a safety spotter with you. It the prop is clear, take air filter off & try spinning ( ENGINE OFF for this ...
You may be able you rescreen it yourself if you are handy. Your best bet is to go up a reputable window & door company & either rescreen or replace. ( put a sticker in the middle that you can see ) Third option- not nautical at all - but practical -...
