The flywheel for the internal coil leads with a North Pole and the flywheel for the external coil leads with a South Pole Norm,
so you just reverse fit the coil.

I was looking into using a Briggs electronic coil on a Victa side pull motor ,the Briggs coil fits the Victa core.

Cheers
Max.

Attachments
Coil reverse.jpg (6.38 KB, 33 downloads)
Briggs Victa external flywheel.jpg (70.58 KB, 33 downloads)