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post #22 of Old 11-23-2009
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a 3.9 HP volvo penta outboard of mine would run fine at high speed , but after a while at low speed it would stop. the spark plug would carbon up till it would not fire. i solved this by putting in a hotter running plug and narrowing the idle jet by putting a very small wire in it to restrict the flow. the float level was OK so that was not the problem.

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