How do you adjust a carb on a chainsaw/craftsman?

Most carbs have a high and low jet. Primary settings is usually screw them in till they stop and wind out one and a quarter turns on both. That should get it started. From idle, you then open the throttle quickly and if it splutters or stops you need to open the low jet a little more to stop this. If it wont start and the plug is wet then wind in quarter of a turn. At full throttle the engine should sound like it's missing. This is called four stroking and it must do this if it's to have any power when cutting. If it screams and is two stroking then you need to richen the high jet up a little till it starts four stroking. I have worked mostly on Stihl cainsaws and their settings are one turn out. Yours might be the same. I just use one and a quarter turns to get it started and then wind back if needed. Fuel mixing is also very important. Try to keep your fuel mix as close as you can to the one you have tuned on as that can upset the running.