Hello Alvin!
Are you saying that the Carter YF is a better carb over the Carter W1?
I swapped out the carbs last October when I found this rebuilt W1 carb thinking it would be more historically correct, however, not too sure it would function as well as the YF. I do not know or understand the exact differences between these two units. Maybe I made a mistake.
Last year when I did the swap from YF to W1, I took her out and she seemed to run fine except for missing and bucking on occasion. Then Lucille sat all winter long and I would occasionally go out and let her idle for a few minutes until warm. She had the ethanol gas in her at that time. Just the other day my friend and I ran the new S/S fuel lines and switched out the ethanol gas for ethanol free premium gas. As I think about it now the plugs were fouled at that time which I did not know. After switching out the fuel lines and gas we took her out for a run and I had a very difficult time getting her back home and climbing the hills around here in Murphy, NC. By the time I got her home she was running so rough that she finally wouldn't even idle and came to a total stop. I let her cool off a bit and was able in about a half hour to get her running enough to get her back in the garage. I then pulled her plugs and found them to be extremely fouled. Cleaned and gaped plugs to .040. Then I noticed that the manual choke valved was not in the fully open position, so I adjusted the connection.
Here is where I started scratching my head. I couldn't get her to stay fired up. Kept dying on me. Then I thought well maybe its a vacuum problem, so I tightened all the vacuum oriented connections. Even went back and tightened the carb down to the intake manifold. She then ran a bit better but rough. That's when I started monkeying around with the distributor trying to find that sweet running spot. No matter what I did she is still not running right. It seemed that she would idle OK, however once I gave her some gas she just went back to running rough again. Matter of fact I couldn't even back her out of the garage.
I feel like I'm pounding my head against a brick wall. Once I stop I know I'll feel better!!
Well that's my story and I'm sticking to it. It seems like it should be a no brainer but I'm getting weary of making stabs in the dark. I really want to see her purring again. I had her running well when I was in SC, but that was pretty flat land down there. These mountains are a challenge, however, beautiful!