Ian, I agree with you about the pick up coil affecting both cylinders, not just one. I doubt changing it would improve anything but don't change it until you finish the primary wire check along with the CDI connector check.
It would appear you've been very diligent and checked everything else properly. Swapping coils and still having the original right cyl miss usually confirms a problem with the CDI (replaced), CDI spade connector in the CDI plug, RH primary wires, RH spark plug(replaced) or RH HT wire(swapped). The only thing you haven't done is check those primary wires to the CDI which you are probably doing now or the connector itself (spade connectors for primary wires) as Mike suggested. Don't give up, this is one of those problems that causes you to second guess everything you know.
I think you are on the right track and anything else we say will be us just repeating ourselves. I can't think of anything else you can do. You checked for plugged exhaust, valve clearance, compression, even tried spraying fuel right into the intake eliminating a plugged circuit in the carbs... What else can you do?????
Last edited by Gregger; 04/26/2021 6:46 PM.
