Lightning Failure Renault

I have a problem with my R11, the ignition fails with the Renault 11, I do the following, I remove the coil and adjust the contacts where the coil is based, I look at it is reheated (I see the plastic of the melted base) to which the fault is due? I don't think you have to remove the bobna and put it again to turn it on? How do I solve that?