I have adjusted the idle screw for a few hours, and easily found the sweet spot, and leaned it until it wont start, and richened it to the point where you realy had to open up the throttle alot to get it running at all.
in the past i adjusted my low by removing the glow and the engine did not drop in rpm, when ever my low was to rich it would die when i removed the glow..... but i am not glow expert just sharing my past
