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As always, thanks a lot Jim & Steven! My neighbors thank you too! Bill K. 69 SQBK NYC --- Steven Ayres <comwest@att.net> wrote: > WilliamK=> 69 SQBK dual carb ... > => What might I start to look at? > > As Jim said, backfire is rare. Most people hear > postignition, from excess > fuel vapor in the exhaust stream. This is usually a > timing issue, most often > spark timing but sometimes valve adjustment. If > you're running too rich > it'll be more obvious. Run your valve, check dwell > and timing, and check > your chokes. > > If you ever get real backfire, you'll know. Keep a > fire extinguisher on > hand, just in case. > > => how dangerous is it? > > It may help to know that most carbed cars do this a > lot on a much smaller > scale, but the muffler keeps it quiet. It's not > dangerous per se; if you've > got a rusty muffler, a big one could blow out the > side, but you needed a > new muffler anyway. It does indicate inefficiency in > your setup, though, and > that *can* hurt your motor. > > Steven Ayres, Prescott AZ > '66 KG1600 > > > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | > mailto:gregm@vwtype3.org > __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com