rich mixture

[gonzo94]

anyone out there no how to adjust the mixture on a metro 1.1 sport,just done head gasket on the wifes metro and new cambelt,started 1st time,run as sweet as it should be,when she got in it the following day she had trouble starting it,when it did start it was running like a bag of nails,after a while it coughed and spluttered into life and started running fine,same thing happened again this morning,took a plug out and it is black with carbon (sign of running rich) if anyone has any knowledge of carbs please let me know.

[gonzo94]

got info i want thanks.