A friend of mine researched this
We at TSBB had several conversations about this, and Bill Butts called the manufacturer who told him they are required to sell new motors with a the small-jet carbs due to EPA requirements, but could sell an after market replacement that isn't allowed on motors sold as new. I took his advice, and bought Item ID:354, 0.07CARB 3R4032001M from Internet Outboards. My OB is 6 HP 4 stroke.
That was in 2009, but I had to stop sailing before getting the boat back in the water. I just got her back in the water in May, and have had no trouble so far.