New carbs- one barrel pulling in too much air Options

[tornik550]

I purchased brand new weber 44 idf carbs from redline weber recently. I set everything equally between all barrels. I set the idle stop at 1/2 turn on both carbs. The engine started right up. I disconnected the linkage. Checked the air flow with a snail. Equal readings on cyl 1,2. Cyl 3 was pulling in so much air it was off the chart and cyl 4 was barely getting any air. I backed off the idle stop completely and I am still getting a huge amount of air in cyl 3 and almost none in cyl 4.

I took the carb off and visually inspected. Everything appears normal. Both butterflies appear closed.

FYI- I am certain that this is not a valve or cylinder problem. Everything was fine with my previous setup.


Any ideas?

[McMark]

Sorry you're the one that's backwards. All air coming into the engine flows through the ventri, so no matter if the throttle plate is opening, or the air-bypass screw is backing out, that air is flowing through the snail and reading higher.

BY-PASSING, the throttle plates and reducing the flow thru the venturi.

NOPE! It's does bypass the throttle plate, but it's still flowing through the venturi. Air entering the 'bypass chamber' comes from the main airflow. There isn't a separate air inlet for the bypass. With regards to airflow, backing out the bypass screw is essentially the same as opening the throttle plate.