[Farmall] gasoline/spark plugs

[E. John Puckett]

I know this is probably opening a can of worms, but I've been having to 
replace the spark plugs in my working cubs fairly often lately.  I run 
Champion D21 plugs, midgrade fuel, and neither tractor burns oil.  Plugs 
won't appear fouled, and tractor doesn't smoke, but old plugs will be 
solid black when removed.  I told the parts man I wanted something 
besides Champions this time.  He gave me AC 87s, but said they probably 
won't help.  According to him most of the local guys still using the 
older IH, John Deeres, etc. for work have all changed over to using 
premium grade fuel.  Only way they could find to keep from having to 
replace plugs every few hours of work time.  Anyone else running into this?

-- 
 John
another one of them
*.?-!.* cub owners