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merc 25 hp fires on 1 cyl. when idle
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<blockquote data-quote="cincinnati" data-source="post: 193982" data-attributes="member: 5561"><p>Compression check: Is bottom cylinder significantly lower than the top?</p><p></p><p>Since the same carburetor feeds both cylinders, through the same set of reeds, look for an ignition problem.</p><p></p><p>The switch box ("powerpack") in my '88 Merc 25HP, failed & the symptoms first showed as a low/idle speed miss. This eventually progressed to an any or all speed miss & finally to the point where the motor wouldn't even start until it sat in the hot sun & was warm to the touch.</p><p></p><p>You can test the other 3 ignition components - stator, trigger assembly & ignition coils - using an ordinary ohmmeter.</p></blockquote><p></p>
[QUOTE="cincinnati, post: 193982, member: 5561"] Compression check: Is bottom cylinder significantly lower than the top? Since the same carburetor feeds both cylinders, through the same set of reeds, look for an ignition problem. The switch box ("powerpack") in my '88 Merc 25HP, failed & the symptoms first showed as a low/idle speed miss. This eventually progressed to an any or all speed miss & finally to the point where the motor wouldn't even start until it sat in the hot sun & was warm to the touch. You can test the other 3 ignition components - stator, trigger assembly & ignition coils - using an ordinary ohmmeter. [/QUOTE]
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merc 25 hp fires on 1 cyl. when idle
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