So I bought this atv with no spark thinking it would be an easy fix but, it never is. I've changed out the CDI, coil, wiring harness, and stator. The quad had spark and ran well for like two days and now it's acting weird. So if I tap the starter switch like 20 times one of those times it will randomly have spark, but then when I release it and click it again the spark is gone. I don't know what it could be, I've made sure all of my connections are solid and in the correct place, all the parts are brand new or off of a running quad to ensure they work. I've disconnected the kill switch wire from the CDI and it's not that so I don't know what else it could be. Sorry for repeating myself a bunch of times, but if anyone has an idea please let me know.

 

I assume you have read the post yesterday, "no spark new stator installed"? As I always suggest in these circumstances, do the tests in the "help diagnose stator" sticky in the engines section of this forum, if any new part tests a bit off, put the original one back, and see if this fixes it.