Carter YF at full throttle opening in resting position? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Curt C · 09-25-2016, 05:42 PM

I am in the process of getting a 1953 GMC half ton running again. The Zenith 228 carb is long gone. I talk to the folk at Carb Exchange and they said a Carter YF will work no problem. They sent me one and I have been looking at it. At rest the carburetor is fully open. It appears that the accelerator squirter arm is holding it in that position. You can actuate the throttle plate no problem but the spring on the accelerator pump arm forces it to rest completely open. Is that correct? Am I missing a return spring of sort? I have never seen a carb rest at full open.

dwcsr · 09-25-2016, 10:06 PM

it should not be open at rest. something is missing or installed incorrectly. It would be extremely dangerous if carbs were like that if the linkage or return spring broke

Curt C · 09-26-2016, 02:08 PM

So I called the Carburetor Exchange and told them what I saw. They confirmed that this is how it was designed. I stated that it was very dangerous should the carb linkage come off somehow. The Rep just stated that he knows it looks weird but that is how it came and that I was the very first person to ever question it. He said install it and it should run fine for my application. I will put an additional spring on it to prevent it from ever going to full throttle on its own. Not sure what else to do at this point.

dwcsr · 09-26-2016, 07:50 PM

it may be the way that carb is. I looked at several YF's and they are also open like that.

mr48chev · 09-26-2016, 09:24 PM

I rebuilt a lot of those years ago but can't remember exactly how they work now and can't find the info I was looking for on the net.

It seems odd that it would have open throttle sitting static and rely on the return spring to hold the throttle closed but that may be the way it is.

Curt C · 09-26-2016, 11:17 PM

It is odd. Thanks for the replies. Much appreciated.

tmoble · 09-28-2016, 10:28 PM

jeeze, nice pics. are those off a cell phone?

tmoble · 09-28-2016, 10:30 PM

yep, they've been like that since back in the 40's. it is weird, but think how many million have been installed and run for years.

Curt C · 09-29-2016, 11:09 AM

Thanks for the confirmation Tmoble. Pics were taken with an iphone6. They do have a nice camera.

09-25-2016, 05:42 PM	#1
Curt C Registered User Join Date: Sep 2016 Location: Las Vegas, NV Posts: 26	Carter YF at full throttle opening in resting position? I am in the process of getting a 1953 GMC half ton running again. The Zenith 228 carb is long gone. I talk to the folk at Carb Exchange and they said a Carter YF will work no problem. They sent me one and I have been looking at it. At rest the carburetor is fully open. It appears that the accelerator squirter arm is holding it in that position. You can actuate the throttle plate no problem but the spring on the accelerator pump arm forces it to rest completely open. Is that correct? Am I missing a return spring of sort? I have never seen a carb rest at full open. __________________ 1953 GMC 100 1956 Studebaker - Chevy 350

09-25-2016, 10:06 PM	#2
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: Carter YF at full throttle opening in resting position? it should not be open at rest. something is missing or installed incorrectly. It would be extremely dangerous if carbs were like that if the linkage or return spring broke

09-26-2016, 02:08 PM	#3
Curt C Registered User Join Date: Sep 2016 Location: Las Vegas, NV Posts: 26	Re: Carter YF at full throttle opening in resting position? So I called the Carburetor Exchange and told them what I saw. They confirmed that this is how it was designed. I stated that it was very dangerous should the carb linkage come off somehow. The Rep just stated that he knows it looks weird but that is how it came and that I was the very first person to ever question it. He said install it and it should run fine for my application. I will put an additional spring on it to prevent it from ever going to full throttle on its own. Not sure what else to do at this point. __________________ 1953 GMC 100 1956 Studebaker - Chevy 350

09-26-2016, 07:50 PM	#4
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: Carter YF at full throttle opening in resting position? it may be the way that carb is. I looked at several YF's and they are also open like that.

09-26-2016, 09:24 PM	#5
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,284	Re: Carter YF at full throttle opening in resting position? I rebuilt a lot of those years ago but can't remember exactly how they work now and can't find the info I was looking for on the net. It seems odd that it would have open throttle sitting static and rely on the return spring to hold the throttle closed but that may be the way it is. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.

09-26-2016, 11:17 PM	#6
Curt C Registered User Join Date: Sep 2016 Location: Las Vegas, NV Posts: 26	Re: Carter YF at full throttle opening in resting position? It is odd. Thanks for the replies. Much appreciated. __________________ 1953 GMC 100 1956 Studebaker - Chevy 350

09-28-2016, 10:28 PM	#7
tmoble Registered User Join Date: Feb 2009 Location: Glendale, Az Posts: 1,062	Re: Carter YF at full throttle opening in resting position? jeeze, nice pics. are those off a cell phone?

09-28-2016, 10:30 PM	#8
tmoble Registered User Join Date: Feb 2009 Location: Glendale, Az Posts: 1,062	Re: Carter YF at full throttle opening in resting position? yep, they've been like that since back in the 40's. it is weird, but think how many million have been installed and run for years.

09-29-2016, 11:09 AM	#9
Curt C Registered User Join Date: Sep 2016 Location: Las Vegas, NV Posts: 26	Re: Carter YF at full throttle opening in resting position? Thanks for the confirmation Tmoble. Pics were taken with an iphone6. They do have a nice camera. __________________ 1953 GMC 100 1956 Studebaker - Chevy 350



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