[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.