Weber help

[356robo]

I believe I have a clogged idle circuit on #3 cylinder. When I cover the velocity stack, sealing off the air supply, no change in idle speed. What is the correct procedure to clean out the idle circuit passages with compressed air? Where are the orificies that need clearing?

Thanks in advance,

Rob

[edmayo]

I remove the idle jet first and blow it out, then run the mixture screw all the way in and see if the idle speed is affected when you back it out, as in setting the idle mixture. If still no change remove the idle jet while the engine is running and use carb cleaner with the spray nozzle tube, and spray directly in the opening for the idle jet. Let engine idle and spray again in idle jet orifice, there should be a change in idle speed as the engine runs on the cleaner. If not you either have a clogged passage or another problem. If still no response, with engine running spay a little into the air horn, that should also pick up the cylinder if nothing else is wrong. You didn't say, has that cylinder EVER run right, if so then likely just dirt.

[356robo]

Thanks Ed.

I cleared #3 float bowl and idle jet. Adjusted all floats. Balanced each barrel of both carbs. Balanced side to side. Adjusted idle mixture screws (I think). Here's my problem: I can get it to idle at about 1200, but when I try to lower the idle using the idle screws, the idle falls though 900 to 600-700.

Help please,

Rob