u/Organic-Expression-8

Hi guys,
I took off my carburetor because I'm experiencing a loss of power.
While removing the float bowl, I immediately noticed black rubber pieces originating from that PVC tube thing where the main jet is located. What is this, and how can I remove it? I couldn't find anything about it in the manual. Also, the main jet won't come out—it just spins in place...

(work in progress) what do you think can be done to optimize her looks