I have found that's it easier to let my engine (3-W) to the talking for me. If they ask why mine is so smooth, that when I say "I"ll get my screw driver and see what I can do. If you what me too?"
After Toms help about a cheap can of air everybody wanted to know what I did. My answer was "my secret"
I don't get into throttle linkage. I just try and get the engine to sound better. Linkage is a whole other subject, and telling someone you know that they didn't do it right gets you nowhere.
Also I do believe in throttle curve. Again another thread topic. Dennis