A lot of people I know don't like Champ Plugs. Quality control issues etc. I use them. I've had a few go bad on me but for the most part, they get the job done fine. At the moment, I have some oil getting in the combustion chamber so no matter what plug I use, it's going to get fouled up eventually. I've tried other plugs without noticing any improvement. I see no reason to change from a classic that works.