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#1
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Do a compression test first but if ign and compression are good and your sure your fuel system is good it could also be a broken reed valve or reed valves not sealing properly. They will cause more of a issue at idle speed than full throttle. And they can make a odd noise if not sealing right because you will have some crank case pressure coming back though the carb/carbs effected. Just something else to check if all else looks ok.
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1983 wellcraft v20 steplift Mercury 250efi on the bracket!!!! 
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#4
10-15-2013, 10:29 PM
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I replaced both switch boxes a few years back. Half the engine would just quit, then come back. All I got done today was a good scrubbing of the boat & I split some firewood.
I'll get on the motor tomorrow, thanks for the input! Doug
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Doug 87 Cuddy with a 94 Black Max 200! & a 1983 Cuddy, looking for power.
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