Nothing wrong with that plug. I use champions and that's all I use unless the customer has some weird aversion to them.

That 61 is a fairly cold plug, yet those look hot. Unless you are at sea level and 15:1 that plug should be the correct range. You can try the 59 but I'm not sure what's going on.


You got a ton of fuel moving through the engine, no timing and plug that looks hot. Something is weird.