[Ford-ferguson] Spark plugs

[Dr. Jim Rosen]

Any ideas will be appreciated. I have been using Autolite 437 spark 
plugs in my 8N.  For the 2nd time a set of plugs went bad after only a 
few hours use. Tractor wouldn't start. After ruling out other 
possibilities, I changed all 4 plugs and the engine started right up. 
(This time I replaced the plugs with Champion H12.)

Does anyone else have a problem with the Autolite plugs?

And what is it about my 8N that could be causing the plugs to go bad?

Thank you,
Jim Rosen
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Dr. Jim Rosen
Clinical Psychologist
Magnet Cove, Arkansas
Ph: 501-623-2050
Email: drjrosen at ipa.net <mailto:drjrosen at ipa.net>