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Old 10-22-2018, 01:49 PM
Large Arbor Large Arbor is offline
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Join Date: Oct 2013
Location: Columbus, OH
Cobra Make, Engine: ERA 714
Posts: 713
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I had a similar issue in my 468. Ran a can of sea foam in the fuel tank and it helped trenmendously. Carbon buildup can be a cause from the carbs not being adjusted as others have noted. The seam foam eats away at the carbon and blows it out through the exhaust.

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