Stihl blower wont idle but runs perfect wide open, why?

R

Rdfish1

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• Feb 11, 2015 / Stihl blower wont idle but runs perfect wide open, why?

• #1

I have a bg55 stihl blower that is 6-8 yrs old and it wont idle nor run while a half speed, but will run all day long on high, wide open. I tried spraying carb cleaner into the carb also pulled the low speed adj screw out and flushed it w cleaner, then reinstalled by lightly seating then backing out 1'turn per the manual. These efforts made no difference whatsoever.

I am trying to avoid a complete carb rebuild or replacement if possible but perhaps that is my only option. Any ideas? Thank you

 

Ric

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• Feb 11, 2015 / Stihl blower wont idle but runs perfect wide open, why?

• #2

Rdfish1 said:

I have a bg55 stihl blower that is 6-8 yrs old and it wont idle nor run while a half speed, but will run all day long on high, wide open. I tried spraying carb cleaner into the carb also pulled the low speed adj screw out and flushed it w cleaner, then reinstalled by lightly seating then backing out 1'turn per the manual. These efforts made no difference whatsoever. I am trying to avoid a complete carb rebuild or replacement if possible but perhaps that is my only option. Any ideas? Thank you

Click to expand...

Try cleaning the spark arrester. Sounds like it's plugged.

 

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Rdfish1

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• Feb 11, 2015 / Stihl blower wont idle but runs perfect wide open, why?

• #3

Should haveentioned spark arrestor clean.

 

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Buzgod

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• Feb 12, 2015 / Stihl blower wont idle but runs perfect wide open, why?

• #4

Unfortunately that carb will probably have to be replaced. Sucks that they view those things as disposable.

 

reynoldston

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• Feb 12, 2015 / Stihl blower wont idle but runs perfect wide open, why?

• #5

Any time that I have worked on anything with a plugged muffler you lose high speed. The PO has high speed but no low speed?? Loosing low speed is more like a vacuum leak or carburetor problem.

 

nhyrum

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• Jun 1, 2017 / Stihl blower wont idle but runs perfect wide open, why?

• #6

have you actually adjusted the low screw? or just the 1 turn out? you may have to actually adjust it. the manual settings will get it to "run" but not very well.

 

reynoldston

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• Jun 1, 2017 / Stihl blower wont idle but runs perfect wide open, why?

• #7

nhyrum said:

have you actually adjusted the low screw? or just the 1 turn out? you may have to actually adjust it. the manual settings will get it to "run" but not very well.

Click to expand...

This was posted almost 2 1/2 years ago. Still nothing wrong with bringing this post up and you have a very good point.

 

nhyrum

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• Jun 1, 2017 / Stihl blower wont idle but runs perfect wide open, why?

• #8

Oops, my bad, I'm usually pretty good about checking dates before posting.

 

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bertsmobile1

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• Jun 1, 2017 / Stihl blower wont idle but runs perfect wide open, why?

• #9

Don't worry, we have all done it from time to time.
The OP never came back with a problem solved reply and the replies he got never explained what he was asking.

The carb has 2 independent circuits which can be thought of as 2 different carbs in the one casing.
The low speed & Idle circuit
The full speed circuit

The low speed circuit is blocked or out of adjustment which one poster suggested adjusting.

 

reynoldston

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• Jun 1, 2017 / Stihl blower wont idle but runs perfect wide open, why?

• #10

nhyrum said:

Oops, my bad, I'm usually pretty good about checking dates before posting.

Click to expand...

I never see anything wrong with bringing old post up. It can always be helpful to someone and berts added some very good information to it. :thumbsup: