Pissed off with motor, want to change

Heres how you really do this.....
If you have headers, you need to just run the motor for a minute or two.....THEN while still running and using a screwdriver handle... run/drag the plastic handle across each primary tube near the flange...A good firing cylinder will have the handle sliding on the tube like butter on a skillet......A dead non firing cylinder will have the handle sticking as you try to slide it around.

But if you really want to burn yourself...go ahead ;)