If a 2 stroke seizes up like that its pretty much rebuild time. The motor should turn freely.... Just lie a sled there could be many reasons. Bad Gas, bad oil/fuel mix, bad injector, no/low water pressure etc etc
My guess is it seized up when the bog occurred. You might be looking a t a new powerhead or it might be cheaper just to hang a different motor on it... you wont know until you pull it apart.
Woodsy
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The only way to eliminate ignorant behavior is through education. You can't fix stupid.
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