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On 9 Oct 2004 at 20:47, Dave Hall wrote: > I would expect that the absence of any voltage marking and the 341 number which > is typical of parts for the earlier carbs means they are 6V. I hadn't noticed that mine were 341 parts while the latest versions are 311 parts. > My tests seem to agree with yours for a couple of NOS choke covers too. > Two NOS in boxes labelled 311 129 191F and marked 6V in the casting were both > about 2.5ohms (non-calibrated meter). Yes, the F version is listed as the latest 6V version. I think this makes it pretty clear that the covers I have here are just first generation 6V covers. > A 12V one on an old carb measured about 12 ohms, which matched another 12V one, > also used. I think I've read that these can lose contact between the heater element and the rivets. I think I've seen an article about trying to tighten that connection back up, but I suspect that it would be hard to get that connection good again once it has gone bad. > Oddly, in view of our conversation about 6v to 12V change-over dates, there are > 6V carbs listed in the parts book in connection with much later twin-port engine > numbers. I wonder if there are some markets that stuck with 6V after all. I hadn't even looked at the this, but the latest 6V carb that I see on my list went on engine T 0 260 000, which was the end of MY '66. This is consistent with 12V starting in '67. Does your list show something later? -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~