Yes, ever notice how often you have to clean or replace them in your Briggs and Stratton Lawn mower?Champion sucks.i used to race Motocross as a lad,and those plugs would burn up,foul up and turn to charcoal. i never liked them.i steted using Bosch in my bikes and then in every car i ever owned,i would try all plug brands to see how they burned.Bosch won...Hands Down.
AC?AC Who? OJ's Buddy?

Lerch