is it still your weed wacker ?or have you converted it?
Purchased two new (reconditioned) Ryobi weed eaters for conversion the same week. While disassembling one decided to use the other as a weed eater to see how it performed.
is your test engine a duall or single ring?
The engine being converted has two rings. If you consider ring drag a problem simply remove the bottom ring. If you perform before and after testing a small gain might be observed.
A Google search for ‘Ryobi Engine’ will find several web sites with hop up information. A search for Ryobi in ‘Tachometer Readings’ will also provide a wide range of engine speeds. Most are propping in mid to high seven thousands. I am not optimistic about numbers above 8000 without extensive engine modifications or a pipe.
Bill