40 IDF mixture problem

[robfike]

I have a pair of 40 IDF's on my '76 912E. I had a problem with the left carb having the rear cylinder WAY too rich and the forward cylinder a little too lean. The right carb is just fine. All jets and air correctors the same. The lean cylinder would pop through the carb, while I only get about 15 mpg.
I overhauled the carbs due to this problem.
It looks like the problem still is there. Anyone have any ideas?
Carbs are in sync.

[maybe368]

Check that the idle jets are not clogged, this is a common weber problem...Mark

[robfike]

Thanks Mark.
Idle jets are clear, float level is 10mm, new gaskets, etc.
Rob

[C. Clark]

Jetting is a process with Webers, you could try different sizes, but I don't like mixing them up. I went up a size and turned down the mixture, that worked for me, I think I run 55 or 60's, my Webers came with 50 if memory serves.....every cylinder is an individual and has to be tuned accordingly.
best of luck,
Chas.
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