In a lot of cases like that you'll find that the carb has been replaced, and the geometry of the linkage on the new carb (length and angle of the throttle arm, for instance) is enough different to throw things off.
I've had them go both ways. I replaced the Carter on my SuperC with a Zenith, and it operated over the bottom two thirds of the total throw of the lever. Replaced the rotted out Zenith on my BN with a new Zenith, and it only wanted to operate over the top two thirds. In that case, though, unlike yours, the bottom third did nothing, it didn't kill the engine.
Once I got the left side squared away on both, I did some fiddlin' with the springs on either side of the block connecting the control rod and the governor, and I've got all but the last two notches to work with on the SuperC. The BN has been a little less cooperative and required some straightening and adjustment in the angles on the control, but I'm gainin' on it. Got the full range for engine speed on both, low to high idle, just not as fine an adjustment between engine speeds as you would get with the full use of the lever.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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