It is running too lean on the mixture screws, unfortunatly the screws will have anti tamper sleeves on, you need to pull these back to richen the mixture, the way to do this without the correct tool, is to find a suitable self tapping screw, screw this into the end of the caps, when the end od the screw hits the screw below the cap will start to draw off, once it has come back enough it will allow you to enter a 2mm screw driver through the centre and make an adjustment to the screws beneath, un screw both screws ( anti clockwise ) 1/4 turn each, they are fuel screws not air screws so this will richen the mixture, try the saw again, if no better try a further 1/4 turn on the L screw.
Good luck
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