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On My Repair Manual It Says , Spark Plug Rv-15yc (champion) Spark Plug Gap For Magnum ** Vertical** Twins Mv18 Kohler Gap To 0.025 , For **horizontal** Magnum Twins Gap 0.0035
REMOVE THE SPARK PLUG, RECONNECT THE CABLE AND WHILE THE SPARK PLUG IS RESTING ON THE BLOC OPERATE THE STARTING PROCEDURE AND SEE IF THE PLUG IS SPARKING.
Husqvarna are traditionally 5/8", but some of the newer mowers powered by a Honda engine could be 13/16. You can pickup a 3 pc spark plug wrench set for under $10.
This may not fix your problem but it does deal with that engine. I just tried to replace the spark plug in that engine and it took me 5 hours. The Kohler plug in the engine that came from the factory cannot be found in traditional stores and it is a strange size, 11/16 or 12 mm. The Kohler plug is #1413211. I could not find a match in a book. Divine intervention lead me to a place where they were fixing the Kohler 149cc engine that had the same plug in it that mines did. I discovered that a Champion 8815 does fit the engine but it takes a 18mm socket. It did fix the problem and the mower works. Hopefully this will save someone my hassles.
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