Blue spark is best ! That means the ignition system is in good health. I have also seen engines run fine with an orange spark as well. But as a general rule, if you have 5 blue sparks and one orange, the orange on has an issue. Always compare different cylinder sparks and then go diagnosing to...
Possible bad ignition switch or kill switch. Think about what is changing from running good to when it doesn’t run good. If it runs good at times then it is probably not the ignition system itself, more likely a bad ignition switch or possible a bad ground or wiring. The switch changes everytime...
I have a 1994 Evinrude 175 two stroke with an idle speed misfire. Good compression, carbs are perfect and just rebuilt, spark plugs are new. Wires seem good. Spark in all cylinders seems good as I checked them with a tester. It seems one cylinder is misfiring every 2 or 3 seconds..It runs...