I have a PA .61 Side Exist  serial # around 470 (it is in a plane so i cannot see it exactly).
Using the muffler that came with the engine.
I just wanted to know what is the 'factory setting'  for :

1. Ventury size (I have 2 : # 11 and #13) and
2. Number of head shims.

I use 13*6 2 blade props.


Norvald