Stihl BG55 Blower with single screw carb adjusting

ran440

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  • / Stihl BG55 Blower with single screw carb adjusting
Hi all
I have a Stihl BG55 blower with one of those carbs that have 1 adjusting screw that adjust mixture and idle. Not the usual 3 screws, high low and idle. I'm told the blower is about 8 to 10 years old. Manuals on the Stihl site do not cover this carb.
So does anyone have information on how to adjust this type of carb?
Thanks,
Randy
 

Russ2251

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  • / Stihl BG55 Blower with single screw carb adjusting
It's an EPA carb and, as a consequence, is not adjustable.
 

ran440

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  • / Stihl BG55 Blower with single screw carb adjusting
It's an EPA carb and, as a consequence, is not adjustable.

It does have 1 adjusting screw on top and the local Stihl dealer said it was for both mixture and idle. I thought that was kind of weird.
 

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bertsmobile1

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  • / Stihl BG55 Blower with single screw carb adjusting
For Rotary valve carbs there are two possible "top Screws"
The rotary valve both rotates to act like a butterfly and raises which moves the needle higher in the needle jet thus increases the idle fuel
Some have nothing but a throttle stop screw that holds the throttle open.

Some have a needle screw that is inside the throttle which raises the needle without rotating the valve.

They are sort of a combination of a Needle slide type carb and a butterfly type carb
 

ran440

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  • / Stihl BG55 Blower with single screw carb adjusting
This is a butterfly type carb.
 

ILENGINE

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  • / Stihl BG55 Blower with single screw carb adjusting
just need to be careful about posting service manuals and parts diagrams, because Stihl has been known to have complete websites shutdown over their manuals posted on websites.
 

Fish

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  • / Stihl BG55 Blower with single screw carb adjusting
just need to be careful about posting service manuals and parts diagrams, because Stihl has been known to have complete websites shutdown over their manuals posted on websites.

Nahh, not anymore.
I have been putting them up for 5 years now.
 

ran440

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  • / Stihl BG55 Blower with single screw carb adjusting
UPDATE :

Followed the instructions in that manual for initial settings. Started up the blower and it was a new machine. Ran perfectly with no further adjustments needed.
Very Cool.
Thanks everybody :)
 
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