I like it when it is reported what fixed a problem when help is requested.
Earlier post described how throttle shaft broke on JD 430 W while brush hogging and tractor rpm ran away before I could shut it off.
After repairing carburetor, tractor did not have power it had before.
Lot's of good advice.
Found push rod thrown on 2nd cyl. and rocker arms loose. I was running on 1 cylinder.