It takes a special tool that the dealer will not sell you. The workaround is to take the carb off and cut a slot in the screws. What I did was to cut a slot through the aluminum housing deep enough to slot the mixture screws. Worked like a charm.
barrister86, April 2011
You need a special tool to adjust the carb, patr no. 530035560 available from any Husqy/Jonsered/Flymo dealer
