This is FS55 carburetor without priming. Reason and description are in the video.

Few more details - At 1:22 you can see a picture of dismantled carb, and one like "piston" with rubber O-ring is marked, that O-ring is problem, change this O-ring, or complete "piston". As per Stihl service, it's possible to buy only this piece. Stihl OEM part number - 4229 121 5800 (check picture here - [ Ссылка ] - position 31)

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