1850 spark plugs

KFFarm

Member
Are there any good spark plug manufacturers left? Have an 1850 with Pertronix ignition, Pertronix coil, and Pertronix spark plug wires. Spark plug failure is a big problem. They dont foul, they just quit firing, frequently. Have tried NGK, autolite, probably another I dont recall right now. The tractor runs strong, just cant keep spark plugs firing in it. Any and all suggestions welcome.
 
I've got the same problem with my 77 and to a lesser extent the 1600. I run ACs in them. My son told me to gap them wider until I
find the sweet spot where they don't do it anymore. I couldn't tell you what they're actually gapped now. I just keep spreading
them with my knife until they don't start missing.
 

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