In Reply to: Ford 8N backfires through carburator posted by Wade on October 05, 2020 at 12:19:14:
Check to see if you have compression. I had a similar problem turned out to be valves sticking. If you donít have a compression tester take plug out, hold finger over hole, bump starter and see if if you can feel suction or pressure pushing finger off of sparkplug hole.
Probably not your problem but easy enough to eliminate.