I wonder if they removed the impeller, as well (from the drive end of the governor)?
At some point it was determined they were not needed.
They pulled air from the intake tube, (after the air filter) and pushed crankcase gasses out the vent tube (the opposite of how most PCV systems work).
NOT sure why they were eliminated in later tractors, and often disabled in older units, but it PROBABLY has to do with the advent of better/modern detergent oils that help eliminate sludge buildup.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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