Overhauled Bendix Scintilla SF4 Install Issues

[OregonCoastCubCoupe]

I sent out my original bendix scintilla SF4 mags for overhaul to address a rough running mag issue. They were sent in after a heavy mag drop and poor firing when on mag 2. Yesterday we reinstalled the mags and after getting them time correctly I was able to easily prop start it. At idle I noticed no difference between idle on mags 1, 2 or both.

After I let the engine warm up I did my typical mag check and when switching from both to two the engine backfired once very loud, lost power and wind milled until I regained power by switching to 1 or both.

Anyone have any idea what the issue may be? Both mags are back from what looks like a first class overhaul, all new plugs and new wiring harness,

Please advise!

Thanks,
David

 

[huston marlowe]

 

[bob turner]

 

[huston marlowe]

 

[fastmax4]

 

[Jeff J]

 

[43-29080]

 

[nrpetersen]

 

[Jeff J]

 

[OregonCoastCubCoupe]