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I must be on the right track . . .
Here's what I did. At adot's suggestion I set the 4 mix screws to 1.5 turns out from touching. This allowed the thing to idle at 1000 instead of 2000. (before I could not get the thing to keep running unless I adjusted the idle up to 2000rpm). Then I was able to sync them left to right, and front to back. It sounded nice idling, but still poped back through the carbs every few seconds.
Then I tried to tackle the float level. I took top off the right side carb and found the needle valve assembly (with the 14mm hex) had vibrated loose from the carb top. With that tight, I then tried to adjust the float depth. The left carb was ok with only a little adjustment. The right carb, however, never did drip out of the sight hole even with the adjustment screw taken out. I put it in a few threads to hold it there, tightened the lock nut down, and that's where I left it.
I took it for a test drive, all seems good except I still get the popping through the carbs! It seems to happen only at idle, but then again, I can't hear anything when I put the gas pedal to the floor. What's the most common cause of carb popping?
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