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CA erratic spark
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 87273 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2025 at 3:23pm
when you choke it, it will REV UP right ? ... Not something like a timing issue way advanced at high RPM ?  .... Sure it is CARB related ?

What if the Intake manifold or gasket had a leak and was sucking air ? ..... Restricting the air ( choke) makes the engine SUCK harder and more monifold vacuum  ?  Les thought your vacuum was on the low side ?
Like them all, but love the "B"s.
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dfwallis View Drop Down
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Joined: 09 Mar 2023
Location: DFW
Points: 773 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2025 at 3:45pm
Replaced the main idle jet in the tsx. Not significantly different running. It was really difficult to get out. The easy outs are too short for brass. Got most out then retapped the hole. Not going to try the main jet. Too hard to get to and these easy outs won't reach. Misses are back but runs all rpms fineish. So, probably going to send the tsx out for professional rebuild. I've replaced everything in it but the main jet. I also tweaked the float to shut off slightly sooner. No change.
1952 CA13092
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dfwallis View Drop Down
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Joined: 09 Mar 2023
Location: DFW
Points: 773 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2025 at 3:48pm
I think the low vacuum reading was due to cheap uncalibrated meter. But I'll verify when my brother brings a higher quality one.
1952 CA13092
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dfwallis View Drop Down
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Joined: 09 Mar 2023
Location: DFW
Points: 773 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2025 at 3:52pm
I tried adjusting timing with the Zenith...could not resolve the problem.
1952 CA13092
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dfwallis View Drop Down
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Joined: 09 Mar 2023
Location: DFW
Points: 773 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2025 at 3:14pm
Brother brought a better quality vac meter. Engine reads 22 in hg, steady. Agrees with my cheap farmer calibrated meter...
1952 CA13092
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Les Kerf View Drop Down
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Joined: 08 May 2020
Location: Idaho
Points: 1221 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2025 at 6:48pm
Originally posted by dfwallis dfwallis wrote:

Brother brought a better quality vac meter. Engine reads 22 in hg, steady. Agrees with my cheap farmer calibrated meter...

Excellent! Smile
That means you do not have sticky valves and your rings are sealing properly.

Once you get the correct carburetor on there with the proper jetting your troubles should be over.
Hang in there Big smile
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dfwallis View Drop Down
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Joined: 09 Mar 2023
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Points: 773 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2025 at 8:07pm
Place i sent the carburetor to has been repairing all types of carbs for 80 years...and can actually test them...that part wasn't clear at nearly all the other places I looked at...fingers crossed...

Edited by dfwallis - 24 Jul 2025 at 8:08pm
1952 CA13092
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