RE: YS 63FZs Basic Settings
Chip,
I never like to bring in bad news, but it is my experience as well (with a .61SE)...
After a YS engine has not been run for a relatively long while, it will NEVER run well again, until after the diaphragm and other fuel system components have been replaced with new items.
It seems these parts deteriorate over time and this will happen, even if the engine was previously run on all-synthetic fuel.
So it is not castor-goo that you can blame...
The parts are not really that expensive, but S+H sure makes them appear to be...