Help.....
My neighbor has an old Jeep swamp buggy...not sure of year.
On the side of the dizzy it has a vacuum advance unit that has two round shaped diaphrams with one vacuum port, on the inside it hooks to a white plastic piece that slides (like an advance)..that has two black wires that go to a curved shape black pickup and a two wire pigtail off the other end of the pickup.....what years did they use this style system and what do the call these units??? TIA.

Sounds like a Prestolite system. (aka Prestocrap). Is the vacuum advance plastic? If so it's prestolite. Used from '75-77.

Yep.....Presto-crap.....years are correct..... thank you much

it'll also have a gold box on the passenger fender.

is he having a problem w/ the ignition? its probably the gold box. i'd junk the whole thing for HEI or the later motorcraft setup

CJ5-man
yep, replaced gold box...still wouldn't start....pulled vac adv and found bad diaphram...today I got him new Presto-crap and he is gonna try tonight. I told him to switch to HEI..He's a little hesitant.....As long as its HIS $$$$$$ he's wastin, not mine, He can find out for himself:eek: :eek:

BTW....he's already spent $115.00 on presto-shit:smokin:

i remember that presolite stuff being really expensive. I left the gold box on the fender of my CJ and that was 3 ignition systems and an engine ago that I last ran it. Leaving it there for someone on the trail who hasn't figured out that its a big turd :flipoff2: