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 - Tuning Up Your Tractor: Cooling and Fuel Systems, Hoses and Belts - by Curtis Von Fange. Our tractor is coming right along. The old oil and filter has been taken to the recycler and the air filter replacement has breathed new life into our motor. Let's take a closer look, now, at the cooling system since it has to work so hard in the summer heat. Cooling systems can be real cantankerous in their old age. Radiator cores clog up with rust, lime or other mineral deposits and the fins clog up with weed seeds and debris. The metal headers slowly corrode away from years of use and
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