Ok dumb question. Using the spark tester to check the spark distance, how do I disable the ignition/fuel system so the engine doesn't start? Pulling the lanyard kills spark correct? The only time I've had to check spark is when an engine didn't run. Ohmed out spark plug caps and found many where not to the 5-ohm spec. Found out the spark test was the best way to also tell if the coils are up to spec.