Posted by Owen Aaland on August 07, 2012 at 19:50:22 from (216.47.35.56):
In Reply to: Super C spark plugs posted by Brett Helmkamp on August 07, 2012 at 17:57:33:
Increasing the spark gap on the plug is not going to do much to stop the fouling. You need to either remove the source of the deposits, could be fuel or oil, or change to a hotter heat range plug.
I believe a lot of the problems with Champion plugs comes from the changes in fuels, oils, and the way the tractor is used. With the end of leaded fuels, in order to combat fouling, Champion changed the recommendation for standard duty plugs from D15Y to D18Y. There are still some parts books out there still recommending D16 plug which was replaced by the D15Y about 50 years ago. If you are only using your tractor for light duty you probably need to use a D21 instead of the D18Y. If you cross the Autolite 3116 back to Champion it usually comes back as a replacement for the D18Y and/or D21.
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