I have an old style Stihl FS 80 Brushcutter/Trimmer that is about 30 years old.

I really, really like this machine.
However, I have had a lot of trouble getting and keeping it running. Parts are hard to come by and the dealers only want to sell you a new one.

Anyhow, I have a lot of new parts and probably put way more into it than I should.
Also, I am less than mechanically clever.

I have a brand new carb, intake, filter and lots of other stuff.
I have gotten it further than all the dealers I have taken it to.
I just can't get it to run right.
It starts easily and will idle all day.
However, I can't get it to run full throttle. I have messed with the carb screws over and over

Am I looking in the wrong place?