cdi has a black wire (ground) and a blue/green wire (pos)
engine has a black wire (ground) blue/green wire(pos)
kill switch has 2 wires red and black
There is a video here if you want to check out how to wire.
1. connect the blue/green wire from engine to blue/green on cdi and your red wire from the kill switch all togather.
2. connect your black wire from the engine to the black wire on the cdi and the black wire from the kill switch all together.
3. insulate all the wires.
$. the white wire is for a 6v accessory such as a light. if you do not use the white wire make sure you cap and insulate it for if it touches the frame it could short out whole system.