Need some advice from the carb experts, Weber IDF 40s Options

[bondo]

As you may know, I bought a 914 last week, and it came with barely functioning Weber IDF 40s.

Well I got the first one apart, and here is what I found:

Main jets: 115
Air corrector jets: 200
Idle jets: one 45 and one 50
Float valve: 175
Main venturi (choke tube): 28
Aux venturi: 4,5
Emulsion tubes: F11
Accel pump jets: 50 FW
Accel pump bleed back: 55

There was enough crud and rust that I have opted to go for the full rebuild. The float valve had visible wear, and the accel pump diaphragm looked kinda wrinkly and messed up. One of the idle jets was missing its o-ring, and one accel pump jet had 1 extra washer.

Obviously one of the idle jets is wrong, does the rest of this sound ok for an engine that is probably a 1.7 or 1.8? The PO said it ran good and got good gas mileage before it got all clogged up. One air bypass screw was about 1/2 turn out, the other was completely closed (and rusty)... perhaps because of the mismatched idle jets?

[Joseph Mills]

QUOTE (SGB @ Oct 7 2005, 11:17 AM)

Joeseph- I had part throttle stumble from my 40 webers.  Try adjusting the air bypass screw to provide more air to the mix.  After you open those up some, you will have to readjust the mixture volume screws too.  This leaned out my idle / low-speed circuit and made for easier transition to main jets.  My 2 liter likes about 31/2 turns out from the bottom for those air corrector screws, which is pretty lean.  If you get it too lean, besides reduced performance, it will overheat. Royce-

Thanks Royce. I will include that process with my other tuning efforts.

The carbs are back on the car now with only preliminary adjustments made.

I've been waiting to get my EGT senders/gage installed before proceeding with tweaking.

Hopefully this weekend... (IMG:http://www.914world.com/bbs2/html/emoticons/rolleyes.gif)