YF carter carb on 53 m38a1 won't accelerate - JeepForum.com
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Unread 08-11-2009, 03:31 PM   #1
gamebirder
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YF carter carb on 53 m38a1 won't accelerate

I just went through and rebuilt this carb because of overloading issues. There were not a lot of part involved in the kit so it was mainly a clean up and place new gaskets. After reinstalling it would idle fine but as I push the accelorator it would start to die and if I tried to keep it running by pumping the gas it would start backfiring. I have had it back apart twice double checking the float adjustment and metering rod adjustment but still cannot get to run. Any suggestions or would I be better off to just replace with a solex or something similiar. thanks

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Unread 08-11-2009, 05:20 PM   #2
John Strenk
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Sounds like problem with the accelerator pump. Does it squirt when you hit the accelerator? Take off the air cleaner and pump the throttle a few times and see if you can see any gas squirting down the carb.

Did you get all the check balls back in?
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Unread 08-12-2009, 10:43 AM   #3
gamebirder
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Quote:
Originally Posted by John Strenk View Post
Sounds like problem with the accelerator pump. Does it squirt when you hit the accelerator? Take off the air cleaner and pump the throttle a few times and see if you can see any gas squirting down the carb.

Did you get all the check balls back in?
I don't really get a squirt just a few bubbles and a little gas along the edge.
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Unread 08-12-2009, 11:10 AM   #4
John Strenk
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Nope not good.
Mine is a good solid stream.
Did you get the accellerator pump oriented properly?


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Unread 08-12-2009, 07:53 PM   #5
gamebirder
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Thanks for the picture. I think mine is a little different I don't have it in front of me but I don't recall the inlet ball check and the discharge check ball and weight was one piece that had a point in the direction of the ball, also I don't believe the pump jet protrudes into the barrel at all. The actual number on the carb is yf 938s. thanks again.
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Unread 08-13-2009, 05:37 AM   #6
John Strenk
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One of these huh:


Notice the part on the accelerator pump at the top of this page.


Does this look familiar? I found it with a bunch of other YF drawings. This is more of a mechanical schematic than the actual layout.
The old YF and New YF are so close, some of the same gaskets are similarly shaped after 30 years.


Actually there is a great writeup at the CJ3BSite.com site.
http://www.film.queensu.ca/CJ3b/Tech/Carburetor.html

http://www.film.queensu.ca/CJ3b/Tech/Carter.html

Here is another site with some info.
http://www.oldcarmanualproject.com/m...r/YF/index.htm

Still you should get a strong flow of gas coming out of the port for the accelerator pump. Make sure all your gaskets were installed correctly, you could inadvertently block off a hole, and all passages are clear.

Last edited by John Strenk; 08-13-2009 at 06:07 AM..
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Unread 08-13-2009, 06:11 AM   #7
John Strenk
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These are good technical notes:










Last edited by John Strenk; 08-13-2009 at 06:24 AM..
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Unread 08-13-2009, 11:10 AM   #8
gamebirder
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yep this is the one. thanks for all the good info. I will go over this and double check everything when I remove the carb again this weekend.
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Unread 08-13-2009, 11:30 AM   #9
gamebirder
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do you have any idea if a person can still get that discharge ball kit from carter #116-27u. this did not come in my rebuild kit and i think this may be one of the problems. like i said this one does not have a ball but more of a pointed weight. The kit came with some little balls but I never saw any in the carb.
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Unread 08-13-2009, 11:56 AM   #10
John Strenk
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Depends upon the kit. Sometimes the pointed weight can be swapped with a couple balls. I think the smaller one drops in first.

http://www.jeepforum.com/forum/f8/carter-yf-rebuild-question-715326/
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Unread 01-17-2010, 08:27 PM   #11
bprimrose
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1978 cj5 258 carter YF when rebuild had no discharge ball/weight?

Hello,
I have a question RE Carter YF CArb. I rebuilt and found no discharge ball or weight in place. SO....I just put it back together. NOw I have a problem with stall and running until it is fully warmed up? I wold appreciate any help. SHould I replace the weight and Ball?
Thanks
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