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I have a lawn mower with a 18 Hp Honda engine twin cyl. I have about 700 hours on it. One of the Cylynder will not fire when it is cold. I switch the plugs around at least a coule times and it will finally hit and after it warms up it runs on both (no Problem) It has spark on both and when I pull the plugs out--the one that is running is clean but tha one that is not hitting is wet with fuel. Is this a valve adjustment or something else. My email is dkwinchester@wildblue .net

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  • dkwinchester Apr 14, 2011

    I believe you are right. I have new plugs (2x), great compresion, adjusted valves and it still has the same cylinder not firing. The plug is damp when I pull it out.

    Thanks for your help, dw

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Try new plugs but I reckon you have one weak coil. It takes less voltage to fire a plug in a warm cylinder

Posted on Apr 10, 2011

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