To: All 
 
  Hi, 
     I have a Progressive Miniature Avaition Flying Machine and am having 
trouble with the engine burning out plugs all the time.  The engine is a 
YS .45 side exhaust with a MAC header and MAC 8.5cc tuned pipe.  I am using 
15% Cool Power fuel.  The propeller is a 10x8 APC.  It is rich enough so that 
it still has a nice trail of smoke, even in the vertical, but still runs 
without loading up.  I have had the best luck so far running on a ducted 
fan plug, but still only get 4-5 flights before the plug goes. 
 
     Can anybody help me here?  The plane is incredible to fly but it is 
costing me a fprtune in plugs! 
 
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