Interesting about the plug comment.
Before my issues with the engine (replacing the front bearing) I run the O’Donnell, but now I'm running the OS P3 super hot plug and it works great with super low idle.
I remember reading something like once you go with OS plugs you cannot go back to O’Donnell, or Dynamite plugs. Something to do with the OS having bigger thread than the other plugs so it ends up stretching-out the cylinder threads causing it to compression leak? Is that a fact or an opinion?