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My mercury 9.9 2 stroke bogs down in gear and "chugs" (not backfire but hesitates) when in gear unless I have the choke pulled all the way. Neutral is fine, revs up with no issue.

I disassembled the lower end and found the exhaust pipe clogged with carbon (couldn't see through it) I cleaned it all out and reassembled. No change. I do have black oil coming from the prop (exhaust duct). I rebuilt the carb with a new gasket and diaphram kit, no change. Tested the coils, adequate spark. I'm running out of ideas.

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You need a complete rebuild

Posted on Apr 23, 2017

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