Are you sure that 392329 coil you’re using is meant to be used with a points type ignition?
I use the same coil in my 19 and 21 horse opposed Briggs mowers and they have pointless ignition systems. The coil has a module built into it, something like an Atom.
Here’s a link to the coils I’m using: Same P/N.
https://www.amazon.com/gp/product/B00G990HLS/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
Mine is not like yours. Mine is “old school”. It looked new, and came in an original box, but appeared to have been mounted
at one time. It tested okay with an ohm meter.
I tried testing it on the Stevens again, switching the polarity. It still does’t fire until about 3.5 ohms.
Would it matter what position the B&S coil is mounted on the Eisemann laminations?
Thanks.
Prepare to be boarded!