I think Ambull really means 1-1/4 to 1-1/2 turns open. Good starting place for both H and L if you have the fully adjustable carburetor. Many saws were produced with a fixed H jet to keep the operators from running them too lean. There are both Walbro SDC and Tillotson HS carburetors that are fully adjustable, I have never seen a Tillotson with a fixed H but certainly have a few with the fixed jet SDC.
If you haven't done it yet, remove the carburetor, tear it completely down and give it a good cleaning, make sure the diaphragms are soft and pliable, and insure the metering lever is correctly adjusted. The Walbro link above (thanks Eccentric) will provide assistance if you are not familiar with these small carburetors.
If you still can't get it to run properly, pressure test the fuel line and impulse line, check the boot, and if that still doesn't get it pressure/vacuum test the crank case.
You don't want to make a mess of that saw from a too lean condition.
Of course you already did verify that you have good quality clean, fresh fuel in the tank and have replace the fuel filter to rule out the most obvious faults...
Mark