Stihl 661C. Gotchas? Known Issues?

[Redfin]

I can tell you a 660 coil on 661 with the dual magnets doesnt work. It will run, just not very well.

 

[Wood Doctor]

I can tell you a 660 coil on 661 with the dual magnets doesn't work. It will run, just not very well.

Hard to believe, but I suppose it is possible. I never tried that. Thanks for at least posting this finding. I have to wonder then if the 661C coil will work on a 660 or an 066. That seems more likely, but I have never tried it.

 

[huskihl]

They're probably timed 15-20° differently. No idear