When i give my stihl weedeater (fs 55) gas it dies. i changed the gaskets in the carburetor, new spark plug, new air filter. it idles fine just when i give it throttle it dies

It is a fuel / air problem. Do you have a primer bulb, did you replace it and put it in the right way around arrow to the carb? It is a known issue. There are lots of help online and there are some videos below..

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Nov 12, 2009 - I have a BG 55 when fuel tank gets down to 1/2 empty it stalls out. ... run, it revs up to max then dies completely. It will only start on full ...

I'm sorry, but I can't provide a visual diagram as I can't display images or diagrams. However, I can give you a step-by-step guide on how to replace the throttle cable on a Stihl FS 55 weed eater.
Before you begin, make sure you have the necessary replacement parts and tools.
Materials and Tools:

• Replacement throttle cable
• Screwdriver
• Pliers
• Allen wrench
• Socket set

Procedure:

1. Safety First:
   • Ensure the weed eater is turned off, and the spark plug is disconnected to prevent accidental starts.
2. Remove the Air Filter Cover:
   • Locate the air filter cover on the weed eater's engine and remove it. Typically, this involves loosening screws or clips.
3. Access the Throttle Cable:
   • With the air filter cover removed, you should be able to see the carburetor and the throttle cable attached to it.
4. Disconnect the Throttle Cable:
   • Carefully disconnect the throttle cable from the carburetor. This might involve loosening a screw or bolt holding it in place. Note how it is routed and attached.
5. Remove the Handle Housing:
   • Locate the throttle trigger on the handle housing and remove it. This may involve unscrewing parts of the housing or loosening screws to access the cable.
6. Replace the Throttle Cable:
   • Feed the new throttle cable through the handle housing and reattach it to the throttle trigger. Make sure it's properly connected.
7. Reconnect at the Carburetor:
   • Reattach the other end of the throttle cable to the carburetor in the same manner it was originally connected.
8. Adjust the Cable Tension:
   • Adjust the cable tension to ensure it operates smoothly. There should be some slack when the trigger is released but no excessive play.
9. Reassemble the Weed Eater:
   • Reattach the air filter cover, making sure it's secure.
10. Connect the Spark Plug:
    • Reconnect the spark plug and ensure it's properly seated.
11. Test the Throttle:
    • With all the components reassembled, test the throttle to ensure it's working correctly.
12. Start the Weed Eater:
    • Reconnect the spark plug and start the weed eater. Verify that the throttle is responsive and functions as expected.

This is a general guideline for replacing the throttle cable on a Stihl FS 55 weed eater. Keep in mind that specific models may have variations in their design and components, so refer to the user manual or consult with a professional if you encounter any difficulties during the replacement process.

STIHL TRIMMER-WEED EATER REPAIR: stihl carburetor ...

? 6:55
www.youtube.com/watch?v=vK6MsQalprY
Sep 16, 2011 - Uploaded by JEREMY FOUNTAIN Here is what I did for my fussy Stihl FS 250r trimmer....this after sitting all ... STIHL FS80 FS85 FC85 HS80 CARBURETOR ASSY 41371200614 ...

You did not indicate whether or not you have compression now that you have changed out the gaskets and piston rings. If not, it seems to me that the problem could be a) cracked head or block, b) bad valve(s) or even c) a warped head.

Sorry for the bad news (if I am right).

Pumping the primer bubble while the engine is running should cause the engine to over fuel and stall (if the tuning is correct). Sounds like its not fueling enough, pumping the primer is forcing fuel through the carb causing the engine to pick up rev's, but this is soon exhausted which is why it wont rev on the throttle.
* Check that the fuel line is not damaged and drawing in air. (if this is intact try the next step)
* Strip and clean the carb. Replace any diaphrams if needed.
* Check gaskets seal between carb, air filter and cylinder.

Just out of curiosity what standard carb settings did you use.?

easy... if the carb adjustments are still factory set the you just need to replace the muffler screen or also called a spark arrester.it covers the muffler exit....

Turn both screws CW to stops (lightly), then back out CCW 1-3/4 turns each. This a basic setting and both will need to be set leaner (CW) after the engine warms up. Remove the spark plug and check for blue sparks when the engine is pulled through. If nothing, try a new spark plug. If still nothing, try removing the stop switch connection at the ignition module and retry for sparks. If nothing again, replace the ignition module. Use a thin business card to set the pole gap (the magnets should be under the poles of the ignition module) when installing the replacement. If you get sparks in the first test, try spraying some carburetor cleaner in the plug hole, replace the plug, and attempt to start. If you get a pop or two, then you have fuel problems. Check the fuel lines for condition, check the filter inside the fuel tank for plugging, and tightness of the carburetor screws and nuts. Remove the muffler and check for plugging. Check the air cleaner for plugging. If it still won't run, then the carburetor should be removed, disassembled, cleaned, and fresh gaskets and diaphragms installed. Keep track of what went where as you remove parts. If the machine appears to have good compression, it should start. When the engine is warmed up, adjust the H needle to 4-stroke at high speed, but smooth out when cutting. The L needle should be adjusted to allow the engine to run fairly smoothly, but allow the engine to 'follow the throttle'. Idle speed should be set so that the string head does not turn, but keeps the engine running. Hope some of this will get you trimming again!

The problems you are having sounds very much like a blocked exhaust port/silencer. On these small two stroke machines it is normally the cause of lack of power or not revving. Happy gardening !!
Stantheman 19/09/2010

Over the past 8 years, the FS55 has had at least 5 different carburetors, and they have at least 3 different systems with different adjustments. Many of them do not have much of an adjustment and will not cure running problems. If you are experiencing poor running conditions, I would suggest some basic checks first. The spark arrestor screen is a big culprit on this model.

Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression

Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Stihl weedeater was running and stopped suddenly. Put in a new fuel filter and cleaner air filter with soap and water. Checked spark plug and it appeared fine. Started the weedeater, ran for a second or so and stopped. Spark plug wasn't gas fouled. Could it be the carburetor needing new diaphram gasket and spring.