RE: DL-50 engine
It came through.... had to go work on a firewall.
I have only tried to "tweak" a metering valve ONCE, and it was a horrible disaster. So, for me, that level of "tuning" is "replace carb". May not be the real engine guy's approach, but we have to do what we are comfortable with. I'm not comfortable inside a Walbro. Just like I wasn't comfortable rebuilding a Quadrajet decades ago on a Buick.
I'll answer your PM.