The factory will not give carb settings as these machine are set from the factory for the best emmisions, this is why there is a special tool required to alter the screws, the screws are fuel screws not air screws, so as you un screw them ( anti clockwise ) more fuel is let through the carb, your machine is running too lean so the screws are in too far, before making any more adjustments check the fuel filter in the tank is not blocked, check the block the carb is connected too is not loose on the cylinder ( i have seen the screws coming loose ) if all is ok unscrew both screws out a further 1/4 turn and try again.
SOURCE: Husqvarna model 125b Hand held blower (Gas) No
If you have tried a new spark plug and you still have no spark, then your Ignition Coil, (Module) has gone bad. They aren't cheap if you buy it new. Try to find a used one if you can for around $10.
Good Luck!
Jim
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