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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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