Actually, the IH updraft carburetors on H's and M's do have a form of accelerator pump. The air bleed circuit continually bleeds air into the fuel just past the main fuel jet, creating little bubbles in the fuel standpipe. When you snap the throttle open the increase of vacuum on the air cleaner side of the throttle sees suddenly increased vacuum and those little air bubbles in the standpipe explode and push the fuel in the standpipe into the air stream. A no-moving-parts accelerator pump. Just like the no-moving-parts fuel pump on the letter series.
Tractors with the air circuit (through the valve at the end of the throttle plate shaft) plugged or not adjusted right will always stumble upon sudden throttle opening but will do fine on slowly increasing throttle position.
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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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