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Thanks to all of you for some great advice.

This was a genuine B&S kit. It had the thick manifold gasket. Not sure I got the carb to manifold bolts as tight as they need to be. Hard to get a wrench on them. I'll give it another try.

Yes, the kit included a new diaphragm (fuel pump). Yes, a brand new gasket between the carb and tank. I would like to avoid taking the carb off again. It's a big pain in the behind.

Checked the very small hole and found it to be clear. Engine still has a slight surge.

I'll do that tomorrow.

Here's what the "adjuster" looks like. It's all the way in.

This is a picture from the Internet. Mine looks just like this.

My older Craftsman edger is equipped with a 3.5 hp B&S engine. It had been surging at no load. Bought a genuine B&S carb kit and installed it. Problem is better but not gone. This carb doesn't seem to have a mixture adjustment screw. Based on my Googling I suspect it has a "pilot jet." The...