06 yz450f NO SPARK!

Hi, i just bought a 2006 yz450f knowing it had no spark just trying to figure out what the problem is. The guy i bought it from said the only thing he tried was changing the plug. So here's my question would it be the the CDI box or the coil is there a special way to figure this out? The guy said that it was the CDI box. But I don't know any help would be appreciated, thanks.

Yea I did it has none

Anyone else got any thoughts what is more common to go out a CDI box or a coil??

He are some pics of the wires not sure what happened to this yellow wire? ImageUploadedByThumper Talk1369604816.821658.jpg

ImageUploadedByThumper Talk1369605017.636367.jpg coil looks to be fine but I may be wrong?ImageUploadedByThumper Talk1369605093.916341.jpgImageUploadedByThumper Talk1369605115.457922.jpg

Same thing with this wire ImageUploadedByThumper Talk1369605183.223127.jpg

What about these there all just it like one don't know if that's my problem ImageUploadedByThumper Talk1369605261.871473.jpg

ImageUploadedByThumper Talk1369605379.674268.jpg

Any help would be apriciated thanks!

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