in the old days to check the advance was to connect a line to the vac adv nipple, suck on it and see if it would hold your tongue tightly, and if it didn't the diaphragm was bad

with a timing light on it, will it advance to spec when revved ??

sometimes the distributor plate will lock up and you can check that by using a screwdriver and prying on the plate where the arm of the vac adv hooks unto





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1989 300ce smoke silver / brazil, in a constant state of flux ~~~