Does the serial number on the magneto itself happen to end in the letter 'Y'? If so, it won't work without changing the drive gear relative to the cam gear. It is for another application. The reason I know is that I rebuilt one that was configured differently than the H4 mag on my '47 Farmall H. The oddball mag had an impulse that snapped at 90 degrees after top dead center and was stamped XR by the drive lugs.
If this mag isn't what you have, your drive timing is off. Worst case: Your cam gear nut has loosened and allowed the gear to get out of time.
By the way, the third mark on the front pulley is to line up the pilot bearing Alemite fitting on the perimeter of the flywheel with the hole in the bottom of the clutch housing when greasing the tractor.
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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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