This "BS Tip" is concerning the typical carb found on most Honda engines. Two points here that can be overlooked.

The first is the idle feed jet. If blocked it can cause engine surging at full run as it does affect the engine other then at idle, especially if the engine is at low or no load. It also will cause the engine not to idle if blocked.

The idle feed jet is on the side of the carb just below the idle speed screw. If fact, the head of the idle speed screw holds it in place. Both the idle speed screw and idle feed jets are black plastic. You can see them in this photo.

To remove the idle feed jet, remove the idle speed screw. Then the idle speed jet can be lifted out. Two small screw drivers can be used by lifting on the outer flanges of the head but I prefer a pair of "true" needle nose pliers to evenly lift the jet out. The plastic can break so go at it easy.

This is what the idle feed jet looks like as you extract it.

There is a easily seen hole passing through in the lower end of the jet, this is the air bleed from the front of the throat passing through to the idle main jet. What is harder to see is the tiny hole passing from the bottom up to the cross hole. It's a lot like the bowl nut on Briggs carbs. This tiny hole feeds fuel from the main nozzle in the carb center post, up to the idle circuit. As with any fixed jet, cleaning must be done with care not to make the hole larger.

Spray carb cleaner down the recess in the carb, you should see it dribble out the center post/main nozzle area of the carb. There is an O-Ring near the bottom of the idle feed jet, check it's condition before re-installing the jet. The O-Ring is only available in the carb gasket kit if it needs replacing. Put a drop of oil on the O-Ring before re-installing the idle feed jet so it slides in easily without distortion.

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The second area to cover in this BS Tip is the seat area for the float needle. This seat is a plastic molding that is pressed into the carb body.

This has it's own O-Ring at the bottom to seal the seat molding to the carb. Has nothing to do with the needle sealing. Trouble is, this O-Ring can go bad and it isn't replaceable. This can be the cause of carb flooding when you're certain everything is OK. The seat molding is pressed into the carb body and this the carb body is peened in around the seat. I've removed some and been able to find an O-Ring sized close enough to work but normally the seat body is broken when this is tried. The seat body and it's O-Ring are NOT is the parts available list. What I do with every Honda carb is pressure check the seat body for leaks before trying to make any other repairs to the carb. If it leaks, tell the customer the carb has to be replaced. It just isn't worth the time to try to repair if this area leaks. You'll probably fail and end up very frustrated. I've been there a number of time, believe me.