Stan Galat posted:
95% of all carburetion problems are ignition.
But...the Opinionated Pipefitter posted:
Kadrons always run rich. You can work on leaning them out, but they're pretty bad on the idle circuits and the needle and seat are really terrible. If you are generally satisfied with how the car runs (and with getting less than 20 mpg with a sub-100 hp engine), then change the cap/rotor/wires and the spark-plugs with something at least one step hotter.
Agreed. The biggest problem I've seen is fuel overpressure. Lots of people put a mechanical fuel pump on, bolt and go so-to-speak. Sometimes those pumps put out 5 or even 10 psi, and need a big stack of gaskets or a regulator to drop the pressure down to 1.5. No more, no less. And yes, Kadrons(Solexes) can run absolutely fine and stay that way a long time, until a float hangs up. Or the seat gets worn and overpressured.
Just one opinion, but hey, that's what you get for free advice over the internet with no way to actually tell what the problem is. I sometimes have a hard time figuring out a problem with the car in front of me! And then you get to get advice by committee. And then some guys tap out, which I completely understand due to the frustration of trying to give advice that some people will absolutely not take(but not in this case).