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 - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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