L speed screw.That would be nice. I've searched lots of places and never found anything beyond basic tuning guides I'd like to see a trouble shooting guide or a cause & effect guide to tuning. Like if your saw dies when you let off the throttle after a cut, try turning the H screw out a little to richen it up.
If it does a 'cough n die' when you hit the throttle after idling a few seconds, try..........