throw a match into jerry can if smokes a lot its got 2 stroke mixture init. perhaps not a very good idea. if you have a car without catalist or have a mate with one bung it into car it wont hurt it.
moto minarelli,was an engine fitted to lots of bikes. but i dont know what frame it is.poss a italjet.not very collectable as not very well made and allways had trouble getting spares,there was a place in solihull that delt with them.
i doubt its the cdi at fault.i repair motorcycles for a living mainly hondas,i have only put one cdi on a 125 in forty years and that was stolen recorved i think it had been shorted out by idiots messing with wireing. its more than likely its the generator thats at fault.