Carter YF experts, I'm running way too rich
I've got the Carter YF on my L-226 I6 in the Willys. It runs great and everything, but it was running rich as can be, and the adjustment screw did almost nothing.
So last night I took it apart and rebuilt it, expecting a catastrophic failure inside of it, but it really looked fine. The float is the newer brass style, works fine and seems to be adjusted according to service manual spec's. I cleaned everything out, installed new gaskets, and blew out all the passages. I also replaced the pump diaphragm and everything contained in the rebuild it. I put it back together, cranked it up, and now it seems to be dumping more fuel and still won't adjust at all with the idle adjusting screw. I did clean out some crap in the bowl and the pump was in very sad shape, so it runs better now, but is still running incredibly rich. I can screw the adjustment all the way in, and all the way out, and there's no difference.
At this point, the only thing I can think of is that someone rebuilt it at one time and used the wrong jet, or pulled the entire carburetor off a different motor and the jets are inherently way too large. Does anyone else have any ideas? I wish I could find the correct jet size for my application, but for some reason my factory service manual doesn't even have it, and online they only have the sizes on the F-134 and the newer AMC I6s. I reinstalled the jet when I pulled it all apart and it looked fine, I thought I remember it being stamped 70 on the top. The kit did not come with new jets or anything.
1986 Jeep CJ7 4.2L I6 T176 (restoration in progress)
1961 Willys 4x4 Wagon L-226 I6 T90 (restoration also in progress)