44 IDF's

[Jac Mac]

Originally Posted by albanycobra

I was not having any noticable changes with small jet changes so I got some jet drills and drilled out a set of idles so I would have like a 90 size idle jet.
Put them in the car and it drives great with good low throttle response and the sneezing has just about disappeared only a slight random sneez that you cant feel but you just hear. The mixture screws are still different.

When my car was getting painted I removed my webers and I noticed that when you turned them upside down to check the throttle plate to signal hole
gap there was a big difference bewteen carbs. A good carb had the throttle closed and you could not see the signal (progression holes) and the bad carbs you could see the hole, I have just refitted my carbs and later this week will try another tuning session.

Dave & Race it.
Your problems with progression/transition hole position variations is not a new one, this article from a 1960's manual shows how to correct the issues. Not for the faint hearted or unsteady hand. Nothing different to what most carb 'experts' have been doing for the last four or five decades really. Many people simply bolt on a replacement carb & if they are lucky the problem disappears, but they never really work out why. With the webers & due to their cost & 'name' people seem to think they should be better-- Sorry, not so!! Read up on it, understand it, & get to work!!