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dfwallis 
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 Topic: CA Carburetor "Upgrade" Options
Posted: 20 Apr 2025 at 12:56pm |
My 1952 CA has a TSX486 Type A/Fixed Jet carburetor. I put a new kit in it, but the kit doesn't come with a new venturi which is just a bit eaten around the edges. I've not been able to get it to stop missing randomly (at high RPM it misses slightly less). Initially, it ran best with the idle screw adjusted all the way in. I took everything apart and ensured clear jets. I found the idle screw damaged very slightly from over-tightening and smoothed it out with some sandpaper (thought it was new and I'm sure I never over-tightened it, but then I haven't found the original if it was new with the saved parts). This resulted in very slightly better performance and allowed me to back the screw out just a bit, but not much overall difference in behavior.
I suspect a venturi leak may be causing it to slurp some extra liquid fuel in every now and then. I'll consider sending it out in the future for a full rebuild, but in the mean time I wanted to investigate if there are any "upgrade" (e.g. performance, reliability) options.
I see these 2 Zeniths at DJs but I don't see enough information to differentiate the reason for a significant price disparity (I've enquired via email). I assume the second one is the same one that Steiners has as a "universal" replacement.
SKU: 1603-0002
SKU: AB-223D
Edited by dfwallis - 20 Apr 2025 at 1:10pm
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1952 CA13092
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steve(ill)
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Posted: 20 Apr 2025 at 1:10pm |
One says ZENITH and the other says ZENITH STYLE..... Could be a China Knockoff..
I know you can buy Chineese knockoff of the MS carb "style" for under $50.
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Like them all, but love the "B"s.
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dfwallis
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Posted: 20 Apr 2025 at 1:48pm |
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I found a source for a machined venturi replacement. I may try that first.
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1952 CA13092
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dfwallis
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Posted: 20 Apr 2025 at 2:28pm |
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I find sources also that indicate TSX670 on a CA (with TSX670 also interchangeable with TSX701, TSX815 and TSX844 but not enough info to prove it).
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1952 CA13092
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jvin248
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Posted: 20 Apr 2025 at 2:42pm |
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Uncle Tony's Garage channel on YouTube the other day had an episode on stumbling/missing points style engines. Your problem seems like what he said was an old school problem: chasing fuel, plugs, points, condenser... When the real problem is a worn distributor shaft. Fix was to tighten the points gap to compensate, or replace the distributor shaft and bushings.
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dfwallis
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Posted: 20 Apr 2025 at 2:48pm |
 dfwallis wrote:
I find sources also that indicate TSX670 on a CA (with TSX670 also interchangeable with TSX701, TSX815 and TSX844 but not enough info to prove it). |
Looks like the following MS carbs were on CAs (with Zenith replacement)
1952-1956 Tractor CA Allis 225679 TSX486 Zenith: 12522 1952-1956 Tractor CA Allis 225090 TSX470 Zenith: 12522 -1957 Tractor CA Allis 228623 TSX670 Zenith: 12566 Tractor CA Allis 228624 TSX701 Zenith: 12566 -1956 Tractor CA Allis 234228 TSX815 Zenith: 12566
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1952 CA13092
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dfwallis
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Posted: 20 Apr 2025 at 2:53pm |
jvin248 wrote:
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Uncle Tony's Garage channel on YouTube the other day had an episode on stumbling/missing points style engines. Your problem seems like what he said was an old school problem: chasing fuel, plugs, points, condenser... When the real problem is a worn distributor shaft. Fix was to tighten the points gap to compensate, or replace the distributor shaft and bushings.
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Very possible, it has been in the back of my mind. But I do know the carb has issues. It's running a bit too rich. It starts really good though. Barely has to turn over at all and fires right up. My brother said it fires before it even rotates :)
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1952 CA13092
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jvin248
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Posted: 20 Apr 2025 at 3:28pm |
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I bought a harbor freight mini ultra sonic cleaner ($80) and put several carbs through it. Really helps. Dawn dish soap and green/purple cleaner and hot water. Better than a rebuild kit.
Split the carb and put split side down. A little basket from an office desk set for small bits. All fits.
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dfwallis
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Posted: 20 Apr 2025 at 6:16pm |
jvin248 wrote:
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I bought a harbor freight mini ultra sonic cleaner ($80) and put several carbs through it. Really helps. Dawn dish soap and green/purple cleaner and hot water. Better than a rebuild kit.
Split the carb and put split side down. A little basket from an office desk set for small bits. All fits.
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US cleaner is no match for the chemical concoction and mechanical scrubbing and passageway cleaning I used. There's not a spec of rust or other coating. Replaceable Jets were replaced with new. The venturi on the other hand is made out of zinc and portions of it look like swiss cheese. It is likely that it at the very least is not sealing well. A venturi wasn't provided in any of the kits I could find, but I just found one online and I'll install it in May on my next trip. A damaged venturi can definitely cause erratic firing due to inconsistent mixture, but it may have more than one cause. We shall see. We inspected the distributor when we reassembled and didn't notice any unusual play, but will consider that next.
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1952 CA13092
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Steve in NJ
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Posted: 21 Apr 2025 at 10:47am |
Venturi's usually don't come in Carb rebuilding kits. To many variables between Carburetors. Some can be purchased seperately. Some of the replacements now are plastic but do the same job as their brass or cast counterparts. If you suspect it's running rich, you should see black smoke coming out of the stack. Check the condition of the floats and make sure they aren't taking on fuel which will make them sink. Easy way to tell, is remove them and give them a gentle shake. If you hear sloshing, time for a set of floats and that is probably your rich issue.....HTH Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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dfwallis
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Posted: 21 Apr 2025 at 10:58am |
Steve in NJ wrote:
Venturi's usually don't come in Carb rebuilding kits. To many variables between Carburetors. Some can be purchased seperately. Some of the replacements now are plastic but do the same job as their brass or cast counterparts. If you suspect it's running rich, you should see black smoke coming out of the stack. Check the condition of the floats and make sure they aren't taking on fuel which will make them sink. Easy way to tell, is remove them and give them a gentle shake. If you hear sloshing, time for a set of floats and that is probably your rich issue.....HTH Steve@B&B
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I found a machined venturi online (may be aluminum, it doesn't specify). The original zink one is in bad shape. I did check the float, it is fine. Previously the needle was sticking (new needle, old seat, the flats on the needle were getting stuck in the screw driver slots...finally got the old seat out and new one in, no more sticking). However it still blows tiny, sparse specks of carbon, not really lots of black smoke though. Engine newly rebuilt.
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1952 CA13092
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CA13414
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Posted: 22 Apr 2025 at 7:12pm |
My carb kit for my CA, which I bought from DJ's, had new brass venturi's. Granted this is not the "CA carb kit," but something I read somewhere..... indicated this was a good kit for my CA. In short for me it had all the venturi's and it has run great with this kit. Dan
Edited by CA13414 - 22 Apr 2025 at 7:27pm
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Helping the aged survive and thrive! 1953 CA
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dfwallis
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Posted: 22 Apr 2025 at 7:30pm |
CA13414 wrote:
My carb kit for my CA, which I bought from DJ's, had new brass venturi's.
Granted this is not the "CA carb kit," but something I read somewhere..... indicated this was a good kit for my CA. In short for me it had all the venturi's and it has run great with this kit.
Dan |
Cool, I didn't find it a year ago. I got one from Steiners. Anyway I'm not confident a the new one will work, but was cheaper than a new carburetor...if it does.
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1952 CA13092
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CA13414
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Posted: 22 Apr 2025 at 7:32pm |
dfwallis wrote:
CA13414 wrote:
My carb kit for my CA, which I bought from DJ's, had new brass venturi's.
Granted this is not the "CA carb kit," but something I read somewhere..... indicated this was a good kit for my CA. In short for me it had all the venturi's and it has run great with this kit.
Dan |
Cool, I didn't find it a year ago. I got one from Steiners. Anyway I'm not confident a the new one will work, but was cheaper than a new carburetor...if it does. |
Agree the new/refurb carbs are $$$$.
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Helping the aged survive and thrive! 1953 CA
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