Tell you what, my Sanglas has a huge Bosch automotive coil. I have some tiny spare coils from my modern Suzuki GZ250 that I plan to try. Shouldn't any coil be just fine? I mean, I know about the 3 ohm and the 5 ohm and the high voltage and the compression and all that stuff, but coil technology hasn't envolved so much in these 30 years. On the contrary, manufacturing processes allow us to build smaller things. While it's good to be able to repair an old coils, I bought my GZ250 coils for about 5 bucks each. Is it really worth the effort?
Raul