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> This (twin-carb mixture adjustment) is a subtle > adjustment that requires very close attention and some experience, or at > least careful experimentation. > I find the most helpful thing is a CO meter - even with twin carbs, you can easily see when things are correct. It should be the law that there is a car hobby group in every town with one of these owned jointly! Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ----- Original Message ----- From: "Steven Ayres" <comwest@att.net> To: "Type 3 Mailing List" <type3@vwtype3.org> Sent: Monday, January 20, 2003 6:32 AM Subject: Re: [T3] sustained idle problem > ChuckH=> I set both sides @ 1-1/2 turns > => then leaned them just a little. > > That's good procedure to start. What I've found, however, is that it's > usually not even close to right. Variations in parts, crud levels, etc., > make it very rare that the mixture screws wind up set anywhere near the > same. And you can't tell much from the intake balance. > Did you actually rebuild one carb, or maybe just clean it up and change the > float needle valve? It's better to do any full rebuild on both carbs, so > they come back to spec together. They really need to be very close to > identical to perform right. > > Tangential to your problem: if you haven't jetted the carbs for the 1641, > I'd recommend you consider it, as it will make a big difference in > performance. This is particularly true if you're working with 1500 carbs. > > On that helper spring: Most of the springs for dual carbs that I've worked > with have been a little weaker than they ought to be, which I put down to > age. So we often see extra springs in the engine bay. The best place for > this is coming off the linkage on the right, down to the tin, parallel to > the stock one. You'll usually find a convenient loop in the tin there. > > Steven Ayres, Prescott AZ > '66 KG1600 > > > ------------------------------------------------ > To unsubscribe, E-mail to: <type3-off@vwtype3.org> > For more help, see http://vwtype3.org/list/ > > ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/