![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Registered User
![]() Join Date: Feb 2015
Location: durham nc
Posts: 124
|
250 with a 1 barrel carburetor carb needs help
Just put a brand new 1 barrel on and it started right up but was 'floored'. i can't get the linkage right. I adjusted the 'wide' screw on the side (throttle i thought) and now it won't start even. i have a couple of photos of the carb set up. if you are willing may i email 1 or 2 pics of it to you so you can help me diagnose? Thank you!!!! Scott
or... if i can post the pictures here let me know- i haven't figured out how |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,217
|
Re: 250 with a 1 barrel carburetor carb needs help
I'll try to help. I have worked on many of those. Send some photos to georgec2434@yahoo.com .
|
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,217
|
Re: 250 with a 1 barrel carburetor carb needs help
I answered your e-mail explaneing the choke as well as I could. If you have more questions put them on this post & some other guys might help.
George |
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,217
|
Re: 250 with a 1 barrel carburetor carb needs help
I looked at the photos again. There should be a bracket on the side of the carb held on by 2 screws that the return spring hooks to. It may have been left on the old carb.
I can't see a vacuum hose going to the choke pulloff. It needs a hose that will supply full manifold vacuum. George |
![]() |
![]() |
![]() |
#5 |
Registered User
![]() Join Date: Feb 2015
Location: durham nc
Posts: 124
|
Re: 250 with a 1 barrel carburetor carb needs help
Thanks
Im lost It starts but is full throttle even if i disconnect the pedal linkage |
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Sep 2016
Location: Vancouver BC
Posts: 784
|
Re: 250 with a 1 barrel carburetor carb needs help
OK. Have you tried closing the throttle by hand? Get someone to start the truck and as soon as it starts, close the throttle (just move the carb shaft) by hand. You need to find a photo or diagram of the throttle linkage including return spring, as well as the choke linkages, including the vacuum line to the pull-off. Gotta be on line somewhere.
__________________
Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible |
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Oct 2015
Location: grand valley pa
Posts: 52
|
Re: 250 with a 1 barrel carburetor carb needs help
Ok if its the same carb as the old one and the linkage is hooked up the same as the old one why would it go to full throttle ?
|
![]() |
![]() |
![]() |
#8 |
Registered User
![]() Join Date: Feb 2015
Location: durham nc
Posts: 124
|
Re: 250 with a 1 barrel carburetor carb needs help
Ever so slightly different
Ive put the old one back on for now |
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Oct 2015
Location: grand valley pa
Posts: 52
|
Re: 250 with a 1 barrel carburetor carb needs help
|
![]() |
![]() |
![]() |
#10 |
Registered User
![]() Join Date: Feb 2015
Location: durham nc
Posts: 124
|
Re: 250 with a 1 barrel carburetor carb needs help
smart idea. i'll see if any neighbors know how to put a manual choke in
Thanks a lot- to ALL of you Scott |
![]() |
![]() |
![]() |
#11 |
Registered User
Join Date: Sep 2016
Location: Vancouver BC
Posts: 784
|
Re: 250 with a 1 barrel carburetor carb needs help
Your truck most likely has a Rochester Mononjet (M) carb. Simple little thing. I'd take it into the house, clear the dining room table off, and just take some time to figure out the linkage, while enjoying a cold one. Of course, if there's a wife in the picture, you want to make sure to do this while she's gone shopping.
__________________
Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,217
|
Re: 250 with a 1 barrel carburetor carb needs help
Scott has a Roch. Mono-Jet with electric choke. Does someone know of a book that tells all about the Mono-Jet? The problem is The choke is not going off leaving the throttle on the high side of the fast idle cam.
|
![]() |
![]() |
![]() |
#13 |
Registered User
![]() Join Date: Feb 2015
Location: durham nc
Posts: 124
|
Re: 250 with a 1 barrel carburetor carb needs help
That and its a 61 truck with 67.72 motor
Ughh Im sure nothing is hooked up right |
![]() |
![]() |
![]() |
#14 |
Registered User
Join Date: Sep 2016
Location: Vancouver BC
Posts: 784
|
Re: 250 with a 1 barrel carburetor carb needs help
I just checked the factory shop manual for our trucks (I have the 1969), and it's useless on the mono-jet.
Wonder if it is an electrical problem, maybe the ground for the choke is not complete?
__________________
Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible |
![]() |
![]() |
![]() |
#15 |
Registered User
![]() Join Date: Feb 2015
Location: durham nc
Posts: 124
|
Re: 250 with a 1 barrel carburetor carb needs help
Thanks for doing that
Its likely as the truck has no hookup for the choke Pieces and parts,,, |
![]() |
![]() |
![]() |
#16 |
Registered User
Join Date: Sep 2016
Location: Vancouver BC
Posts: 784
|
Re: 250 with a 1 barrel carburetor carb needs help
Yet another reason to convert to a manual choke. Did that many times back in the 60s and 70s when all I could afford was old and worn out vehicles, where usually, nothing worked quite right.
If you do go manual choke, that mono-jet is soooooo simple.
__________________
Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible |
![]() |
![]() |
![]() |
Bookmarks |
|
|