I have a Husqvarna 125B handheld blower, will not stay running

Try a new gas cap. There needs to be air behind the liquid in a vacuum (think plumbing) or it does not flow. Make sure you've replaced all the cracked lines. Allowing air into the vacuum will also stop the flow. It's one of these.

unit is running lean. The lo is closest to the crankcase. Give the lo a half turn out.

Is the gas fresh or old that you used. Since this brand new, it's under warranty. If you've had it for a few days, return to the store from which purchased it. It should run right out of the box without having to work on it.

Have you checked the Flame Arrester in the Muffler. They clog easy and engine can't push out exhaust.

There is a manual lever on these that holds the trigger at different settings. Check and if it is full on, move it to the other extreme.

how does it run with out the air filter in place? maybe its plugged and need's replacement

I have a Husqvarna 125B same problem. Turned out to be a bad gas cap. Doesn't vent properly and starves the engine. I took the gas cap off of my Huqvarna weed eater and put on blower and blower worked fine,

sounds like it's going lean lack of fuel check for cracked fuel lines,primer bulb or leaky carb to engine gasket

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

Put fresh gas/oil mix (if it is a 2 cycle) in the tank.

Put the choke on. Push the primer bulb 3-6 times. Pull the cord until the engine sputters. Put the chock to 1/2 way, pull cord again. Should start and run a bit with choke set there, then in about 10 seconds, put the choke completely off.

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