125BV x leaf blower

There are two recessed adjuster screws on the side of the carb.  Their often set too lean, for emissions.
 
The screwdriver type tools are cheap on Flea Bay and will work.  The screw closest to the block is for low speed adjustment.  The other, high speed. 
 
Adjust the Low Speed  CC to enrich the mixture, maybe 1/4 turn at a time.
 
Keep track of where it was when you started.. You can gently turn it in clockwise, till it seats COUNTING the exact # of turns-for your base line..

Don't know when you bought this machine? I just used the "Husqvarna 350BT Gas Leaf Blower" and I really like the brand. If your 125BV x leaf blower cannot be used anymore, you can refer to the one I am using.