Having to use the choke sure seems to point toward fuel mixture as being the cause... and the things that relate to the fuel mixture are the carbs. Not the coil nor the condensor. A weak coil or condensor could present symptoms similar to an incorrect fuel mix, but the choke shouldn't mask those symptoms. If the choke masks a symptom, it's hard to imagine the cause being outside the carbs.

That said: before you adjust or tune carbs, ensure that the ignition system is working properly.

Before you fiddle with the ignition, though, adjust the valves. Compression first, ignition second, fuel third. Address one thing at a time to avoid introducing multiple variables.

If the ignition system is proper and you have to use the choke, tune the carbs. If the carbs don't tune by following the steps in whichever manual you're using, you may well have the wrong needles.

Or a vacuum leak. If you're getting false air around the throttle shafts, that can make it run lean at speed, and no amount of tuning will make them work correctly.

Good luck!

Cameron
swedishrelics.com