I sanded the points with 320g sandpaper. The nail file was an excellent suggestion CubDeiselFan and I have one but it has a point on it which got in the way.
I checked the timing and it was the same after sanding. Almost perfect. The 'S' is slightly higher than centered in the viewing hole. But that's how it was before I had the stalling issue.
When I mowed the grass, same stalling issue after about 1/2 hour.
Perhaps it is the coil after all. The coil wasn't as hot this time as other times the tractor stalled (it was a cooler day). Maybe it is just getting worse.
It is quite consistent at about 1/2 hour for the first stall whatever is causing it.
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