Sorry, I missed this. Good either which is not most starting fluids anymore. Will combust on any cycle with the piston coming north a 1/4". It can bang off on wrong stroke even if valves are bent and stuffed into the head. It is so volatile it ignights with a bic lighter in the air. I wouldnt rely on it to diagnose my valve condition, or position.
Some of you guys need to learn what and how you are using stuff.