I have been going through this saw and a little rubber piece fell out while removing engine from handle bar and top cover. Didn't notice it before separating. Not sure where exactly this fits if anyone knows these well pls chirp up. This is my first Stihl saw I've owned and second one ever worked on. Anyway, it was part of a nine saw deal I picked up over the summer I posted in the thread below. I have the 031AV and 041 AV Farmboss to get to when this one is running better. Cleaned carb inside and out twice and all diaprhagms are soft and pliable. Saw starts up nicely but doesn't like to come off choke. I think the needle valve lever needs to be bent a little bit more as after running it the metering diaphragm was dry. Going to test fuel cap in a bit but have done a pressure and vac test with no leak down. Just wanted to post this before I forgot about the piece in the first pic. I see it listed in some parts diagrams but still not quite certain.
https://www.arboristsite.com/commun...020-pics-required.338664/page-16#post-7400441post 311
https://www.arboristsite.com/commun...020-pics-required.338664/page-16#post-7400441post 311