Looks like you have hands full with engine change. Thanks for helping me.
That is kinda bad news for me, that coil resistance was fine. I was hoping it they would be weak, and so new coil would give me hotter spark and solve the problem.
I guy I respect told me an old trick was to file the side electrode so its tip lined up even with center electrode. I am going to try that when it warms up.
And I think I better check that zener diode too. I did not mention it but when checking voltage my results were lower than I wanted, I just assumed the cold was dragging down battery, quickly. Started with 13 something across battery. 12 something first side coil and then 11 something after.
Anyway, I will try to isolate where the b/y is leaking, if it is. I think you gave directions to do that. If it is in the case behind points plate is it possible to tape new wire to old and pull through to run a new one?
I have swapped coils, and leads, and coils and leads test the same too so testing confirmed having no effect.
New plugs make it run great. Plug on one side fouls over time. New slides and new needle jet, and hotter plugs ngk7's projected all helped make that time period much longer. Plug looks black sooty not like oil. Compression is 170 on bad side. Plug looks to blacken one side first in vertical line. Could be splash fouling? Maybe I just have a really dirty intake? Now the breather tube shrank and pulled off the connection, and I left it like that(thinking it was a cool chain oiler), not thinking that was where the carb was breathing.
I was trying to eliminate the electric. Actually the good running side does seem to miss intermitently, and briefly sometimes, but it is not bothersome.
If you are positive those coil readings are OK, then I will clean and or replace points, set gap, and retime. Then if still trouble, I will swap carbs side to side, and then if still trouble, I will take the darn top end off.
Are you absolutely sure that secondary reading is OK? I am praying not, cause it would be so easy. Last night I tested my friend's 71 bonne, and his primary coils were right were expected 4.5 ( see mine were 3.4, I mean reading started at 3.9 but quickly dropped and held at 3.4 ) His did not do that, read higher and then drop lower. His SECONDARY windings tested at 9.5 WOW way higher than expected 5 to 6 and way way higher than mine at 4.5
I know this is a real lot of info, all over the place.
I can't really do much at this point, it is too cold to wrench and test. But I really appreciate your help.
I have been pondering why it seems from complaints I have read it is 98% of the time the LEFT side that fouls plugs? Any ideas