Hi, I am trying to identify this carb. It Says Carter WO on the body, but there seem to be some differences with what I see on the web. I know I am missing some linkages, but the air horn is different and it looks like some linkage in the back for the choke is different . I have looked at all the carter models but I just can't seem to make out what went on here. Can anyone shed some light on this? It was suggested on the CJ2A forum to try here. They also thought it might be from a VW.
What you have there is either a 431 or 853 “Universal” carburetor. Since they could be put many engines, of different displacements, it has that Hi-Speed circuit adjustment needle. Not standard for a CJ-2A carb, the 431S was an export carb for Austin Motors in Britain. Its later iteration, the 853S was deemed a “Universal” carburetor model and used on many different motors. Here’s a link to a conversation we had four years ago on the CJ2A page. Sean posted a link to the spec sheet for it.
Great, thanks for the info. I just got this jeep and am anxiously awaiting spring to get it on the road. The previous owner ran it all summer last year, and I don't think he had any issues with the carb. From what I read on the CJ2A page about it, it works just as well as the stock carb. Thanks again for the help. This is my first Willys and I am having one hell of a blast with it.
OK, So I have identified this carb as a 431. I used the fact sheet and compared some of the dimensions of the metering rod and main venturi, pump jet # and low speed jet #. I have engine stall issues on right turns at idle due to the gas in the float bowl sloshing to the left. I adjusted the Float level to 1/2" as per manual. Did not help. Now, the question I have is why does this carb even work on my CJ2A, as the fact sheet says it is for 45 to 75 cubic inch motor. I mean I can't complain, the engine runs great. Idles nicely, and I get it up to about 50 MPH max. Am I losing out on anything with this carb? Should I get myself a 596s?
OK, So I have identified this carb as a 431. I used the fact sheet and compared some of the dimensions of the metering rod and main venturi, pump jet # and low speed jet #. I have engine stall issues on right turns at idle due to the gas in the float bowl sloshing to the left. I adjusted the Float level to 1/2" as per manual. Did not help. When you adjusted the float, was that adjustment checked with the gasket off? Another thing to consider is this. With the tank in a low fuel condition, it is possible to uncover the “J” tube fuel pickup in the tank and suck air. Another possibility is a very low idle RPM. 650-700 RPM is recommended. Now, the question I have is why does this carb even work on my CJ2A, as the fact sheet says it is for 45 to 75 cubic inch motor. I mean I can't complain, the engine runs great. Idles nicely, and I get it up to about 50 MPH max. Am I losing out on anything with this carb? Should I get myself a 596s? The Model 853, its first cousin, was designed for European motors up to 130CI. As long as you are having no major issues the only reason to change to a 596S is for peace of mind.
Yes, the float adjustment was done with the gasket off. I had your video on at the same time. Yeah, if I had the 853 the specs seems closer to the 596. However, With the measurements I got, I do not think it is the 853 but the 431, and that is why I adjusted the float to 1/2". But maybe it is the 853 and I need to adjust the float to 3/8". I can see the 853 working but would a 431 work also?
Post by Scoutpilot on Aug 10, 2016 12:50:44 GMT -5
No. The 431 wouldn’t. 70CI is the biggest motor it is capable of running. I just mounted an 853 Body on a 596 throttle. Float is set at 3/8”. It runs great. A road test went well. I’m looking into the possibility of using these in a high altitude (6000’ MSL+) application since the high-altitude metering rod is no longer available.
OK, so there are 3 sections to the carb, the body flange ass'y (mine is marked 235 S), the float bowl section (mine is marked 0-607) and the air horn ass'y (mine is marked 6-291 with a circled C and R). The pump jet part # stamped is 48-80, this would correspond to the 431. The low speed jet ass'y is marked 11-166S, also 431 part #. So my question is what carb is this? or what parts are from where?
I just verified a few more part numbers off the carb. Here are all the numbers I found along with the carter part # in brackets. Body flange assembly = 235 S (1-236S) Low speed jet assembly = 11-166S (11-166S) pump jet = 48-80 (48-80) Metering rod jet assembly = 120-135S (120-135S Float bowl assembly = 0-607 Air horn assembly = 6-291 (6-292S) All the above carter part #'s are specific to the WO 431S, SA and SD According to the fact sheet this shouldn't work with this engine.