Originally Posted by Stu @ M Developments

Kev,
Turn your CO screw 5 turns clockwise then 2 turns anti clockwise, then check your CO with engine hot and fans off, expect sub 1% but up to 1.5% is fine. Feel free to tweak co screw by up to 1 full turn eoither way from that position (Which is dead central) Never go further or expect idle problems, especially when cold.