Hi m8.
Try to get it setup before you do anything mekanic.
Ign is std set to 6` the markings is ón the plastic pease just over the cranck wheel.
There is some triangluar tops down there, big small big small, and ewery big is 6 deg between, so first one is 0deg next 6 aso.
Metering screw is a quarter turn is about 3-5 % CO so you get the feeling that it´s sensitive, so try turning it anti-clockwise one quarter, and then see how it does, when it then runs get it as stabel @ idle as possible with the screw, and if you dont have a co% gauge, take it to a tuner or garage that can help you with it.
Std is about 1,3%co but performes best arround 3% and if it´s chipped i set them to arr 6-7% then i know for sure they get enough and it also help cooling the pistons etc, but dont go over 7% then they get to much.