I used Champion exclusively up until I had a shop pack of J19LM plugs stop sparking after running in several different engines for as little as 3 minutes. Put 5 plugs in the same mower one day, and then had to replace it two days after the customer pickup up the mower because it died while mowing.Hello ILENGINE,
I agree with you when it comes to most automotive applications, but I just have not had issues with Champion on the small engine stuff.
It's for sure most resistor plugs are worthless if they have been dropped on a concrete floor or mishandled, because the barrel resistor inside the porcelain gets cracked. Drop a couple of known good old ones or new ones and then test the resistance (before and after) with an Ohm meter.
Kohler does not actually manufacturer their spark plugs, but it is hard to track down who does. I suspect NTK/NGK makes them under a private label agreement contract.
Many filters, oils, plugs and other parts are made this way for most assembly plants and manufacturers.
Just had issues last summer with Champion plugs in a Kawasaki engine. Had to attempt to use Champion because NGK were not available and all 4 plugs I tried in that engine would not restart hot. They would work after cooling off, the original NGK that I took out didn't give those issues, as well as a different NGK heat range plug that I also tried.