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ok i imported AceMastermind's no Helmet Cody Model
Extracted the face and deleted the body
then put it on a clonetrooper and deleted the clonetroopers head
and i put the clone imgame
but i got a problem with the chin

and there is also some problem with the rest of the model
but idk what
HELP! Please

Looks like you just weighted it incorrectly.

how can i fix it?

Yep, like Mav said, your weights are off, spend more time adjusting the weights in XSI.