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Model 917.272911 20hp twin cyclinder B and S eng. 42inch cut. From the front facing the engine, the left side is not working. I have changed the spark plug twice, switched the two armature mags from one side to the other. There is spark and the engine runs ok on one cyclinder. Spark plug is wet and appears to have fired but when I take the plug wire off it makes no change. There is compression on both sides. I am now lost as to what the problem is. Please help, thanks. Bob

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If the plug is wet that cylnder isn't firing. Use a compression gage to see if both cylnders are the same,you may not have enough compression on that cylnder. You may have lost valve clearance on that cylnder, its usually exhaust valve. A simple valve adjust ment will correct it.

Posted on Sep 29, 2010


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