250 with a 1 barrel carburetor carb needs help

[scottmitchellrose]

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

[Wrenchbender Ret]

I'll try to help. I have worked on many of those. Send some photos to georgec2434@yahoo.com .

[Wrenchbender Ret]

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

[Wrenchbender Ret]

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

[scottmitchellrose]

Thanks
Im lost
It starts but is full throttle even if i disconnect the pedal linkage

[LongBox]

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.

[1970 charlie]

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 ?

[scottmitchellrose]

Ever so slightly different
Ive put the old one back on for now

[LongBox]

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.

[Wrenchbender Ret]

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.

[scottmitchellrose]

That and its a 61 truck with 67.72 motor
Ughh
Im sure nothing is hooked up right

[LongBox]

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?

[scottmitchellrose]

Thanks for doing that
Its likely as the truck has no hookup for the choke
Pieces and parts,,,

[LongBox]

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.

[1970 charlie]

Originally Posted by scottmitchellrose

Ever so slightly different
Ive put the old one back on for now

What's different between the new and the old?

[scottmitchellrose]

smart idea. i'll see if any neighbors know how to put a manual choke in

Thanks a lot- to ALL of you

Scott