Clean the air filter and spark arrestor (muffler). Try turning the "H" needle 1/8 turn CCW and retry. no better turn it CW 3/16 and try again.
This is a very good adjustment explanation.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.
If problem persists reply (below) and we will continue. HTH
Lou
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