[Greaser]

I have a cazador utv it has a gy6 170 cc engine.
It cranks over fine buy has no spark at the plug.
I have changed the cdi, the coil, ignition switch and stator.
Still no spark.
I have checked the wiring from the switch to the rear and all seems good. Is there a safety switch that can kill the spark?
On the brake pedal their are two switches both have the same color code. One is disconnected I figure the other is brake lite.
When I went to use it a couple of weeks ago it started fine and as I drove it it started cutting in and out. I stopped it and it died and hasn't started since.
Any ideas? Where I live know one works on these.

Thanks greaser