minimum clearence without making contact..
leave cover off,and with spark plug unscrewed & out, but in contact with housing, re connect hi tension lead to plug.now becuase thiers no compression i use a 18 volt battery drill driving correct magneto hexagon nut with suitable socket this way you can see how the spark is jumping across..
peter riley
May 2006
A business card works well.
tom
April 2006
.010 inches will work
Rick
April 2006
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