Sounds like a carb adjustment or passage blockage is causing this. Factory issues happen and unless it's caused by something that got in your fuel and into your carb, it's possible there's a piece of trash or you need a mixture screw adjustment.

Without seeing it and hearing it run and ramp up it's hard to say which jet(s) could possibly be blocked or not allowing enough fuel flow. It could possibly be tuned out, or could need the carb gone through. It's almost impossible to say without machine in hand.

 

I've read that the latest Husky 150BT may have a fixed high speed jet or it's covered by a plug. Would you have any knowledge about that? Is there an EPA plug to prevent access to the jet?
Thanks for your response.

 

Fuel filter in tank, spark plug? I would look at these first before changing anything or adjusting the carb. Try running the fuel a little lean, it can't hurt it for testing.

 

The blower is only 3 months old and it starts fine so I'm sure it's not a spark plug issue. And I use the same fuel in my chain saws and weed wacker so I'm not concerned about a fuel ratio. This has something to do with the carb air/fuel mixture but I don't know how to adjust it.

 

The problem with your issue is it requires all 3 adjustment screws, or what normally would be all 3 to allow all 3 ports open "fully" to allow gas through into the carb to achieve full speed. It could literally be any of the 3. Even though it starts properly, is it actually idling low like it should then ramping up properly?

There are a ton of videos on youtube on how to tune a carb, The Repair Specialist, Mustie1, James Cordon, Vintage Engine Repair...etc. The problem could still be contamination or blockage even in a newer blower. It's not unheard of for factory mistakes to happen, as I mentioned, so you could have either a trash or tuning issue.

EDIT: Forgot to mention, you could have an air leak somewhere. I would concentrate on the fuel issues first then move to that kind of diagnosis, as it's much harder to pin down.

 

I assume you're including the idle screw when you say "all 3" adjusting screws, however the idle is fine. The problem is that, to my knowledge, Husqvarna eliminated access to the high and low speed screws that allow adjustments to the air/fuel mixture. I'm trying to find out if anyone knows if there are any EPA plugs that can be removed to allow access to the adjusting screws?
To your second question, it doesn’t seem to ramp up as quickly as I think it should and the rpms fall off if I pull the throttle trigger past 3/4 throttle.
Thanks for your response.

 

Spark arrestor screen in the exhaust? Easy enough to pull and clean usually.

 

Would that need cleaning after using it only 4 times???

 

I've only used it 4 times now and for not more than 3 hours.

 

Many of the companies use the same carb on a lot of different machines. You may be dealing with Welch plugs that would need to be knocked out then replaced after cleaning.

These can be hit or miss and sometimes you have to use a combination of new and old parts but a replacement is $20 on Amazon.

Also found this in one of the reviews that may help you:

 

Problem solved. After viewing a few videos I found out where the high speed adjustment screw is located. It's accessible without removing anything but I removed the carb to get a better view. Instead of seeing a slotted screw there is a round piece of plastic with tiny grooves around the edge. Apparently Husqvarna designed this so it has to be adjusted with a specialty tool by them or a dealer. To overcome this I ground down a cheap set of needle nose pliers which fit tightly into the little hole with the plastic adjustment cap and was able to rotate it a 1/4 turn. That did the trick. Now it ramps up quickly and moves a lot more air that it did at 3//4 throttle.
My 150BT was factory tuned way too lean which would have eventually scored the piston or burned a hole in the top as I saw a video of one poor guy rebuilding his after owning one of these for just a few years. I found a lot of complaints similar to mine and hope this thread will help someone else. Now I'm wondering if anyone makes an aftermarket tool for this?
Thanks for all the replies and helpful suggestions.
By the way the serial number on mine indicates it was built in November of 2023.

 

One of these kits probably has the tool you need:

Amazon.com : carburetor adjustment tool kit

 

Thanks for the information. My carburetor looks like I need a 21 tooth splined adjusting tool which I can purchase separately. I can't believe no one knew about the availability of these specialty tools, and that richening the fuel air mixture is so simple on Husqvarna leaf blowers. I hope this thread will save someone else a lot of heartache. 1/4 turn out was all I needed, runs great now. Note: the plastic splined adjusting screws is a little buggered up in the pictures because of the makeshift tool I used.