I have a question for all the engine experts on the list. 

What are the pros and cons to wider vs. smaller gap in our spark plugs.  The given range by Champion etc. must balance several parameters.  I am trying to get a feel for why one would choose to be on one end of the range over the other.  Also. what might be expected outside the specified range, too small or too large.

I am assuming magnetos here.  I imagine the answer might change with EI.

thanks,

Chris Zavatson