Need Holley 5200 expert help - my car is running lean!

[Corellian Corvette]

I know this sounds like an unusal problem. Got my 200I6 running again in my 65 mustang.

I rebuilt the carb, set everything back to stock specs. Tried to start and the carb is running very, very lean. I put my hand over the top of the venturi and the idle speed RACES up.

I was able to get it working by using the secondary stop screw and opening up the secondary quite a bit (at idle). I also have to back out the mixture screw ~ 4.5 turns to get it to idle properly.

Long ago, when I knew a lot less, I messed around with the Pri/Sec Idle Jets, and the Pri/Sec idle bleeds in a way that probably got everything all backwards.

With these carbs, how are the bleeds supposed to be arranged? Are the secondaries supposed to be larger like a 4bbl? Or do you keep the secondaries smaller?

Here's what I know is there now

Main Jet "255"
Secondary Jet "239"(which is bigger then the 255?)

High Speed Bleed (PRI) 185
High Speed Bleed (Sec) 195

Idle Jet (Pri) 50
Idle Jet (sec) 90


I have a feeling this is not at all right. But I don't know how the bleeds balance each other.
Any advice?

 

[Ronbo]

There was a sticky one time that covered a feww of the fellas setups. You could compare against those and get a ball park idea.

Ron

 

[BENJENBROOKS]

viewtopic.php?t=49901

try this link, there is also a weber 32/36 jetting page in the small six stickies section.

Good luck,

 

[Corellian Corvette]

OK I've spent time looking through all the tech articles, and I still can't get the car running properly. I know I have some electrical problem which is causing the hard start. However, once I get it running I still have to back out the idle screws over 4 turns! Alternatively, I've noticed if I crack open the secondary more then spec, it will run better. The rebuild instructions say to have the secondary stop screw out 1/4 turn after contact. On my car, it looks like it wants to be 1 full turn or more.

I know my float level/choke/etc. is good. Could it be possible the car want's to be even richer?

I've re-jetted the carb as follows

Main Jet "165"
Secondary Jet "160"

High Speed Bleed (PRI) 195
High Speed Bleed (Sec) 185

Idle Jet (Pri) 75
Idle Jet (sec) 50

Pump - 55

Any help appreciated!