RPM Issue on Husqvarna 150BT Gas Leaf Blower

[Chevboy0167]

Found this... no longer available tho....

 

[thenne1713]

If unadjustable carbs designed for 50:1, why would anyone TRY to run a different 40:1 mix, as more oil= less gas= LEAN?

 

[Automender]

Just got done replacing the carb on my one 150BT and it was running extremely rich at full throttle opening.. Pulled plug after a few minutes and it was coked up. It would not reach the full RPMs and air flow was inadequate. I had to adjust the needle valve lever to get it to reach higher rpms. It took three times to get it to a decent running rpms but the transition from low range to high speed was bogging down. It took a fourth time of bending the lever until that was corrected. No high speed needle adjustment is a pain to deal with. I suggest if the OP just got the blower to take it back to place he bought it from.
After trying the lever adjustment I noticed a small screw on the aftermarket carb that the OEM didn't have. And guess what it is a high speed mixture adjustment. A few seconds later I was able to increase the airflow and high end speed,

This is the one I got from Amazon. It was a little more expensive than most of them on Amazon.
https://www.amazon.com/dp/B09NC2FBFR?ref=ppx_yo2ov_dt_b_fed_asin_title

 

[Analyst Man]

Hi, if its new new take it back to the dealer or if its new to you, adjust the high screw.

I don't know how to reply to everyone who offered suggestions so please see my last comment where I post the solution.
Thanks for your help.

 

[Analyst Man]

Just got done replacing the carb on my one 150BT and it was running extremely rich at full throttle opening.. Pulled plug after a few minutes and it was coked up. It would not reach the full RPMs and air flow was inadequate. I had to adjust the needle valve lever to get it to reach higher rpms. It took three times to get it to a decent running rpms but the transition from low range to high speed was bogging down. It took a fourth time of bending the lever until that was corrected. No high speed needle adjustment is a pain to deal with. I suggest if the OP just got the blower to take it back to place he bought it from.
After trying the lever adjustment I noticed a small screw on the aftermarket carb that the OEM didn't have. And guess what it is a high speed mixture adjustment. A few seconds later I was able to increase the airflow and high end speed,

This is the one I got from Amazon. It was a little more expensive than most of them on Amazon.
https://www.amazon.com/dp/B09NC2FBFR?ref=ppx_yo2ov_dt_b_fed_asin_title

I don't know how to reply to everyone who offered suggestions so please see my last comment where I post the solution.
Thanks for your help.

 

[Analyst Man]

Without holding it in my hands, sounds like a 1/4 turn on the high jet may be needed to lean it some, clockwise.

I don't know how to reply to everyone who offered suggestions so please see my last comment where I post the solution.
Thanks for your help.

 

[Analyst Man]

#11

Hmmmmm.... shows not available


View attachment 1218244 View attachment 1218245

I don't know how to reply to everyone who offered suggestions so please see my last comment where I post the solution.
Thanks for your help.

#19 here https://www.walbro.com/wp-content/uploads/2016/01/WYAseries.pdf

 

[Analyst Man]

Those carbs usually have adjustment screws. But special tool needed to adjust and are not easily seen. Dealer should have it.

I don't know how to reply to everyone who offered suggestions so please see my last comment where I post the solution.
Thanks for your help.

 

[Analyst Man]

he said it was new, but then again should have picked up on plugged exhaust too- as lots of people call "their" stuff new when it is in fact 2+ years old with 20 tanks of fuel ran through it. i presume it is under a month old with only a tank or two of fuel used

I don't know how to reply to everyone who offered suggestions so please see my last comment where I post the solution.
Thanks for your help.

 

[Analyst Man]

Yeah. Running 40:1 in something meant to run 50:1, that would be my first guess too. Oil content higher than designed for.

I don't know how to reply to everyone who offered suggestions so please see my last comment where I post the solution.
Thanks for your help.

 

[Analyst Man]

If unadjustable carbs designed for 50:1, why would anyone TRY to run a different 40:1 mix, as more oil= less gas= LEAN?

I don't know how to reply to everyone who offered suggestions so please see my last comment where I post the solution.
Thanks for your help.

 

[Analyst Man]

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. It ramps up quickly and runs at full throttle with a lot more air moving now than at 3/4 throttle.
My 150BT was factory tuned way too lean which probably would have scored the piston. 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?
I apologize for the way I responded to everyone, and If I missed anyone. Thanks again for everyones help.

 

[cscltd]

Amazon sells them. Husky didn’t want to make it like that with special screw. EPA and c.a.r.b. did.

 

[Automender]

I don't know how to reply to everyone who offered suggestions so please see my last comment where I post the solution.
Thanks for your help.

Curious on what way you turned it. Was it lean or running rich? I am thinking turning it clockwise would lean it out.

 

[Analyst Man]

Curious on what way you turned it. Was it lean or running rich? I am thinking turning it clockwise would lean it out.

Counterclockwise. I assumed it was running lean because 3/4 throttle the fastest rpm and they dropped off quite a bit when I went full throttle like it wasn't getting enough gas for the amount of air being sucked in. 1/4 turn out and it's running great now. Revs up quicker too. Before I did the 1/4 turn open there was a lag and slow acceleration to its highest RPM, which was 3/4 throttle.

 

[Analyst Man]

Those carbs usually have adjustment screws. But special tool needed to adjust and are not easily seen. Dealer should have it.

Yes, I finally figured that out, thanks. Ordered a 21 splined adjusting tool.