Need Help With Weber Carbs, Won't idle Options

[michael7810]

1972 1911cc with IDF40 carbs, 50 idle, 140 mains, 220 AC jets. Engine & carbs were rebuilt 13K miles ago. Plugs and all ignition parts replaced about 3K miles ago. I have not driven the car much since June, in fact I have not put gas in it since April. My car ran great the last time I drove it about 6 weeks ago. It's finally cooling off in Phoenix so I decided to get it ready for winter driving. So before starting it up I replaced the accelerator pump diaphragms and pulled the float covers off. The bowls were dry and I noticed that 1 of the floats was starting to crumble so I installed 2 new floats, set at 10mm and 32.5mm per the Weber manual. The car started up normal but would not idle. It was running rich (9.0 on the AFR gauge). I let it warm up and it still would not idle, it usually idles fine once the heads heat up to 200F. I adjusted the throttle plate stop screw in a turn to increase the idle and it barely idled, still very rich. i turned the mixture screws in all the way and it idled a little faster but still very rough. The AFR did go up to about 12.0. I cleaned all idle jets and it didn't change. Still the best idle I can get is with all mixture screws turned in all the way. I drained the gas and replaced with fresh Shell premium but that did nothing. It revs OK and runs smooth above about 2K RPM. It seems the problem is with the idle circuit. Is there a way to clean out the idle circuit without disassembling the carbs?
Thanks for any help/suggestions.
Mike

[euro911]

WTF, you don't look like you're old enough to retire, Michael (IMG:style_emoticons/default/confused24.gif)

(IMG:style_emoticons/default/laugh.gif)

Jets aren't the only places where varnish can build up and clog. There are a lot of passages in the carb body that also need to be cleaned out. Look at small ports in the throat above and below the resting position of the throttle plates. That may be where your problem lies.

I'd pull the carbs completely apart, soak the bodies and your jets in solvent (is Berryman's Chem Dip still available?), then blow compressed air through all the passages, followed by spritzes of carb cleaner through everything and compressed air again.

[michael7810]

WTF, you don't look like you're old enough to retire, Michael (IMG:style_emoticons/default/confused24.gif)

(IMG:style_emoticons/default/laugh.gif)

Jets aren't the only places where varnish can build up and clog. There are a lot of passages in the carb body that also need to be cleaned out. Look at small ports in the throat above and below the resting position of the throttle plates. That may be where your problem lies.

I'd pull the carbs completely apart, soak the bodies and your jets in solvent (is Berryman's Chem Dip still available?), then blow compressed air through all the passages, followed by spritzes of carb cleaner through everything and compressed air again.

30 years at Honeywell is enough! (IMG:style_emoticons/default/headbang.gif)