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Old 04-08-2011, 11:45 AM
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Default issues in 99 merc 9.9?

Any issues to be aware of that are chronic in the 9.9 mercury outboards made in 99?
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Old 04-20-2011, 11:59 AM
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Default jones

9.9 has a history of carboning the exhaust tube and won't open up but will idle as long as it is not completely plugged. caused by a lot of trolling and not running full throttle after trolling.
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Old 04-28-2011, 04:08 AM
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Default

Just run some sea foam .. And that will keep the carboning down minamal
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