Carburetor problem??

[JEDCJ80]

I attached some photos of the carter I have on my AMC 258 i6 / 4.2l . It seems to run fine but it is a complete dog going uphill. Maybe 35 mph tops. I am not sure if it is the carb or the way it is setup? I just picked this rig up a couple of months ago. It runs an idles fine, Just seems really underpowered going up hill.
Any advice??

 

[gert]

Start with the basics then to get a baseline check yours plugs to see if your running rich/lean. Check compression. Due a leak down check, timing check

When was the last time it had a tune up


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[Lumpy Grits]

What size tires are you running?
What's your R&P ratio?
Have you looked for vacuum leaks?
Have you confirmed the correct ign timing?
I would move that fuel filter from being over the exhaust manifold. If the hoses start leaking-Guess were the fuel drips.
LG

 

[JEDCJ80]

I am running 33 inch tires and haven't noticed a vacuum leaks. I don't have the ability to check the timing. The plugs were changed 3 weeks ago but the old ones still looked pretty good. Cap and rotor looked good. Does anyone know exactly what carb this is? Any known issues?

 

[Lumpy Grits]

Your R&P ratio really comes into play here w/33" tires.
You will need to pull the rear diff cover, and count the ring gear teeth and divide that with the pinion tooth count to learn your ratio.
Is there any writing or marks on this carb?
LG

 

[ZEN357]

Have you considered a different Carb such as an Edelbrock or maybe an EFI system? Just a suggestion.

 

[mriplaybass]

There is also a number stamped into the edge of the ring gear as a fraction. In other words: 41 10 or 41/10, 41 9 or 41/9. If you divide the larger number by the smaller, you will get your gear ratio. 41/10 = 4.10 ratio, 41/9 = 4.56 ratio, etc. You can also put the Transmission in neutral, raise one rear wheel off the ground, place a mark on the driveshaft and improvise some kind of pointer to align with the mark. Then put a mark on the raised tire and fashion another pointer. Rotate the tire one full turn and count the number of revolutions the driveshaft makes. If the driveshaft turns about 3 1/2 turns, you probably have 3.54 gears, 4 1/2 turns would be closest to 4.56, and so on. Not exact, but close enough that you can look up what gears are available for your differential and extrapolate what you have.

 

[CJ]

Good post Mr Bass,

Here is some more info... -->> https://www.jeep-cj.com/articles/powertrain-3/how-to-tell-what-gear-ratio-is-in-your-cj-34/

 

[JEDCJ80]

Carter 2250