im sure you miss someting cause i done that befor and thats working fine for me peace!

sry for my eng in french
you have to re edit all the .repo file in yum repos.d and the yum.conf just create new one for repo file and mv -ir command for replace them an cp the yum.conf to your desktop reconfig it and move tem back.
good luck and use the force!
if you want i can seen you the file just pm me