Intermittent spark only when I play with the on off switch. I've pulled my hair out on this thing, new CDI boxes, new coil, new rectifier, new battery. Neutral light is on ... Blue spark from plug when I play with the switch. I did change the switch. and same problem still. There's gotta be...

I am working on my brother's 06 400ex and I am having issues. A few months back he was riding acrossed a field and the ATV just shut off on him. We figured it was something electrical because everything still works (lights/starter/etc.) so we just rode the other quads and let it sit. Well...