Did the throttle blade screws turn at all?
Threads get peened/bradded, from the factory, to keep the screws from coming out. Some more than others. I've had to file the threads flush with the shaft, on some, before they would screw out. Looks like yours has enough threads hanging out the bottom to grab with keen nose pliars and screw them out the bottom.
If the only problem with this carb was idle, not sure I would change anything but throttle blades. And find some one that knows about the mixture screws.
Something would be bad wrong if a weaker power piston spring changed how much idle fuel the carb has. Piston at its lowest supplies enough fuel through the jets to run at highway speeds.
May need to get part numbers off the top, main body and base plate to see if this is even "one" carburetor and not a frankenstien put together. Kenth or Cliff can probably help with that.
Clay
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