Back flushing '93 Merc 75 hp?

harringtondav

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Joined
May 26, 2018
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This is on behalf of my neighbneighbor. He dug mud and lost his witness water pee stream. He installed a new impeller, but still has no stream. I suspect a clogged cooling jacket. Muffs won't clear it. Is there a flush port in his powerhead?
 
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