Guys, I'm pretty sure the carb is sorted. Didn't use any new parts, because I'm cheap and it looked pretty good to start with. Jets are clean, float works.
....but the Fantic still won't run reliably. Really looks like an ignition problem now. It starts when cold, runs OK with the occassional hiccup and then suddenly dies after riding for 5 minutes never to start up again. Obviously at that point you keep kicking like a maniac, drown the thing, kick some more, slide off the tired kick starter, sprain your ankle and utter very, very naughty words.
I can feel the gods of Italian motorcycles mocking me. Ha! Joke's on them, I've had a Cagiva with electronic injection and numerous other crappy 80s and 90s motorcycles. And these days I have access to a proper motorcycle workshop with lifts and heating and tools and compressed air........so bring it on.
Ignition troubleshooting mode.....ENGAGE!!
When I spin up the crank with an electric drill the spark looks weak and irregular, like it skips every 8 rotations or so. When I hook up the multimeter to the leads from the stator these are the values. Mind you, resistance is measured statically and voltage is measured while running the crank with an electric drill.
Brown - Red 5.0v (ac) and 111 ohm
Brown - White 5.6v (ac) and 0.6 ohm
Brown - Green 49.5v (ac) and 372 ohm
Lacking a proper manual...am I doing this correctly? Do these values look familiar? I've tried pulling the flywheel to figure out what is what but it's some exotic size I don't have lying around like 32.