Running Poorly At Idle

I only used to solex to test it and make sure that the carburetor is my problem I don't plan on running it so I don't see the point in paying the money for a regulator so I'll just order a rebuild kit for the Carter and call it good.

Thanks guys I'm calling this fixed

 

i just finished soaking the Carter carb in a 1 gallon jug of Berryman carb cleaner with the basket inside for about 2 hours. then i sprayed it really good with carb cleaner and wire brushed off old gasket material with hand brush, sprayed again with carb cleaner, blew through every passage with air and now its ready to go back together once the kit arrives.

carb looked really clean and i didnt find any clogged jets or debris at all. but when i removed the diaphragm thingy on a stick i inspected it carefully and it seemed like it wasnt really that soft of rubber maybe starting to get hard and looked like it had a very tiny tear in it, it was rebuilt with new diaphragm about 4 years ago and i would think it would have lasted longer but might be something to do with ethanol. not sure if that diaphragm having a hole would have caused my surging but it looked like the only questionable condition in this carter carb. from looking at the carb it looks like engine vacuum pulls that diaphragm down which sends fuel out that little hole in the side of the throat near the #13 stamping which was erratic spurts of fuel previously.

there is some play in the throttle shaft but i dont think its that bad. ive seen worse anyway

once i recieve the kit and reassemble i will post about how it turned out after rebuild

 

well after soaking the carb parts all separately then spraying with carb cleaner and blowing all passages with air. i then rebuilt this carb with new gaskets and new main jet and new metering rod and it is still surging/ hunting for idle rpm

so it seems yes we have determined it is a carburetor issue.

but i still havent figured out the "whats wrong with the carb thing"

i didnt remove any of the brass or aluminum casting plugs in my cleaning, it has never been necessary on any of the other carbs ive ever done. and i wasnt sure i could replace the plug leak-free

but it seems to be a fuel delivery issue. i tried disconnecting the fast idle "arm" so i could choke it as i wanted without it affecting the actual rpms, and i after manually manipulating the choke to about 90 percent closed almost fully choked i could then get it to idle nice and low about 750rpm with the surging hunting gone.

after running it and shutting it off i noticed the low speed jet "the jet that has the long straw thing built into it" didnt look wet like its not getting any fuel through it. i have the float set to 5/16 with the gasket removed.

where in the carb bowl does the gas start its path into the low speed circuits, which hole in the bowl?

maybe tomorrow i will manuall fill the bowl of the carb by pouring gas directly into the bowl and see if my hunting goes away for temporary

 

Are you able to put a vacuum gauge to the running motor? What is the fuel pressure? What is the fuel flow rate? Is the tip of the needle black Viton, or solid brass? Brass needle setting is 5/16”. Viton tipped needle setting is 9/32”. Are you certain you have the correct Metering rod and metering rod jet? The wrong set will cause this problem. You’re chasing your tail right now.

 

'You’re chasing your tail right now."

x2. Over 80 posts on this issue.

Time to get things into spec, one step at a time. Do it to the numbers, "by the book"

 

Carb kit came from oreillys. Made in USA. Didn't come with any jets or metering rod. Mostly gaskets and float valve. I am using the brass float seat, set to 5/16

I have some play at the throttle shaft so I also tried packing bearing grease around the shaft to see if that was my issue and it didn't help

After inspecting the original metering rod stamped xx-1500 or something like that. Original was really worn. So I replaced it with a new metering rod and new main jet that I never used from the last master rebuild kit from walcks.

I am not sure if I am setting the metering rod right. I found a video supplied by Mikes carb shop on YouTube but how to set yf metering rod but the one he was teaching had a screw to adjust metering rod and the lighting in the video was really bad making it hard to see what he points at etc.

Yes I'm sorry for the very long thread but most of this thread has been diagnosing electrical, then tune up, then finally carb checking

 

Also I did check and make sure all gaskets lined up well and that they didn't block any passages when installing the carb kit

 

"Carb kit came from oreillys."

"I am not sure if I am setting the metering rod right. I found a video supplied by Mikes carb shop on YouTube but how to set yf metering rod but the one he was teaching had a screw to adjust metering rod and the lighting in the video was really bad making it hard to see what he points at etc."

It seems you are not taking the advice you are getting, after asking for it.
You are randomly introducing more and more unknowns, instead of working systematically to reduce them.

At this point each and every specification needs to be verified and, one by one, each correctly established before the next can be made accurate. Otherwise the complications are infinitely expanding.

 

Did you not say you had a working Solex? Put that back on with a good base gasket and a pressure regulator set for 2 psi and be done with it.
If you want the Carter to be used on your motor, you need to reassemble it and send it off to a reputable carb rebuilder and service center.

 

You also say the JEEP came with the Solex installed. Where did the Carter come from? Is it a JEEP Carter, or is it a Ford Pickup Carter?

 

When I rebuilt my yf this is what helped me. http://cj3b.info/Tech/CarbsDave1.html

 

Best I can tell yes it is a jeep carter it is a yf938sd that i bought off ebay and has been on my jeep for years without issue until recently. But I think I am getting really close to solving this carburetor issue.

I have made another video that appears as though I can fix the surging issue by manually operating that post that sticks out under the carb and attaches to the throttle shaft using a small bracket and a small arm.

If I pull that rod down, from under the carb. It will kill the engine immediately.

However if I push that rod up a little, about 1/8" the surging goes away and it runs perfect using this carter.

So I am trying to figure out if I want to bend that little arm that attaches it to the throttle shaft. Or see if I need to mess with the metering rod

 

Have you confirmed that the rod number and jet size are appropriate and compatible, before you start bending things?

What would have changed - since you said this set up was running okay previously???

 

best i can remember i dont believe anything had changed. it was running perfect, and then it wasnt.

After reading the FSM many many more times because it was kinda confusing because it was talking like do A then C while making sure F is in touch with G etc etc i came to no longer be confident i had the metering rod adjusted properly. it also had said the metering rod arm should come down and contact the accelerator arm and it wasnt. metering rod was bottoming out before the 2 arms would touch. so now i believe it is adjusted properly and it is running well again using the Carter Carburetor

thanks guys and sorry i dragged it on so long. I am striving to be a better mechanic someday