The 1 1/2 turns is a starting point. Just so we know where were at check the float settings and power valve if it has poped back through the carb it could have taken it out.
Get the eng running turn the screws in one at a time till in nearly kills the eng.
Then back them out till the idle smoothes out. It may take going back and forth a few times to get it right.
From one eng to another the final setting can be vastly differnt.