It's very interesting to come onto this forum and find that the ole Allis tractors have trouble with the Champions. I race cars and when I first started, I was running Champions and with the compression I was running (13:1 or so), I was blowing the ceramic out of the steel housing (it made an awful noise). I also have a WD-45 that I play around with. I never could get it to run right, but it has champion plugs... HMMMM. That might be part of it, but I think it has other demons, as well.