My gk 76 keeps fouling the plugs . The carbs got a new kit in from litetek. The needle c clip
is in the second from top groove and the mixture screw 2 turns out .
Main jet 100#
Pilot jet 47.5#
The plugs are wet after about 10 minutes and the fan does not come on.
If I clean the plugs it starts and idles but, then it start to mis fire again. Do
I turn the mixture screw in or out ?

Wind them in to 1 3/4 turns. Make sure your carb balance is correct, idels around 1000rpm and has no air leaks.