Key switch

I don't get it. The key switch has 2 wires. The engine has the 3. Black, blue and white. White is useless, blue is not needed, so there is only black wire. How do I wire both switch wires to the engine??
 
I don't get it. The key switch has 2 wires. The engine has the 3. Black, blue and white. White is useless, blue is not needed, so there is only black wire. How do I wire both switch wires to the engine??
Blue wire from the engine goes to CDI and black wire goes to the CDI but first it goes to the key switch, that's it. Don't over think it.
 
The cdi has 2 inlets. Does only 1 inlit need to be used then for each wire? Does this look right?
 

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