Carter AVS Lean Spot

[kawahonda]

I went out and rechecked and looks like I'm in spec. I don't understand how the fast idle linkage works. I took a picture of how it looks when I measured.

Looks like the pump height is correct.

[kawahonda]

I'm now considering to change the linkage hole for a faster shot and adjust the pump height.

Bottom hole is quicker shot, correct?

[bennydodge]

Fast idle is not engaged in that photo(screw that is facing downward engages the fast idle cam-the choke has to shut move all of the linkage). You say the "s" link was backwards and you switched it? Drive it and see if this makes a difference-it might. If it's still the same, I would try lowering the pump stem a little and leave the pump rod in the middle hole. It's important to only make one change at time when doing this kinda stuff..

[kawahonda]

Sounds good.

Yep, The "S" link didn't make a difference in drive-ability.

I'll move the pump down a tad. What would you suggest? It's basically at the stock position now.

[kawahonda]

I just moved it to the top most hole and set the height to 11.1mm or so. Doesn't take long to do.

NOT setting the height after that is a must, because if you don't set the height and just move the linkage to the top hole, you'll be nearly 14mm of pump height.

Going out for a drive!

[kawahonda]

Didn't seem to get better or worse. Still there.

Here's a video of it.

Options:

1) Lower the pump by a milimeter? Keep pump in "rich" position.

2) Recheck float heights. According to my chart, they should be set to 7/32".

3) Start drilling out spare squirt nozzle. to .045-.047

[kawahonda]

Took the air-horn off. The float height I'm measuring at 7/32. In-fact, probably a little smaller than that because sliding a 7/32" bit under the rear of the float lifts it ever so slightly. So Chryco, it sounds like this is where you would leave it since it is a bit smaller than 7/32" which means there should be enough fuel in the bowl.

At this point, my only option is to either reassemble and fudge with the height of the pump itself, or I can get to drilling one of my spare nozzles. What would you guys recommend? A .005 increase?

I can tell you guys that when I replaced the stock nozzle with a .043, it went from falling on it's face (could get it to die actually if not careful) to "OMG, this is really drivable and intermittent now, and when it does happen it's far more mild". So going bigger was definitely a positive change. Sounds like I could probably go even bigger.

[734406PK]

Try: Check your base timing and advance it 3 or 4 degrees, reset your idle speed and see what happens to the flat spot. Easy to do.

[kawahonda]

Late to the party on that one!

My advance is maximized before ping with a re-curved dizzy.

I have a .0465" jewler's bit. I have a bunch of bits in the mid .05 range, but I feel that's too much of a step up....

[bennydodge]

That is a wicked stumble. Try lowering the pump stem. You may have the wrong plunger as stated earlier. Make sure the secondary air door is not floppy loose-this will effect tip-in if it's super loose. Drilling is a last resort in my opinion.

[kawahonda]

The pump came in K4084 (MIke's Carb Kit). It looks to be correct?

https://www.carburetor-parts.com/Carter-AVS-Carburetor-Kit--69-71-Chrysler-Plymouth_p_653.html

The air door isn't overly floppy or anything like that. It does have some tension. That was set by the book and not-touched sense.

Keep in mind, I would be drilling a spare edel tip that I would never otherwise use, so there's no "oops" risk on that one.

I have the air horn off now. Floats confirmed to be correct.

Considering to drill my spare (edelbrock) nozzle to .0465 and throw it on. It's a small step increase.

If you thought that stumble was wicked, you should have saw it with the .033 nozzle.....

[bennydodge]

Not sure on the kit. quadrajetparts.com has photos and detailed info on dimensions. I would check this first.
https://quadrajetparts.com/accelerator-pumps-c-299_130_131.html

Since you have the top off you can measure the pump plunger

[734406PK]

Not sure on the kit. quadrajetparts.com has photos and detailed info on dimensions. I would check this first.
https://quadrajetparts.com/accelerator-pumps-c-299_130_131.html

Since you have the top off you can measure the pump plunger

You may have some mis-matched parts there and drilling the squirter out is just compensating for and error elsewhere. Check out the carb component part numbers carefully to verify the correct application.

[kawahonda]

2.2" long....

[Chryco Psycho]

I would drill the squirter