Hi list,
Trying to track down a lumpy low idle on my '71 B that has eluded me for a
long time. Seems like it would be a vacuum leak, but not sure. All ports on
the intake are plugged currently (found the vac advance was shot today, so I
disconnected it and plugged that port). I'm wondering about the remaining
emission plumbing, and if it could be a factor. Air Pump and Run-On valve are
gone. A 'Y' line from the carbs and a line from the fuel tank evap are both
connected to the top of the charcoal canister. The large port on the bottom
of the canister has a plug in it. The valve cover breather is not connected
to anything. I tried connecting the valve cover port to the top of the
canister, and unplugging the lower port - no change. I'm probably way off
track, but I've been through the carbs, timing etc over and over. A clue may
be that it runs rich, even if I lean out the mixture all the way (air cleaner
off). By the way, carbs are orig HS4's, AUD 465, reshafted about five years
ago (and slightly leaky), new needles/seats/floats. Looked at the needles
today and they are both marked AAL. What am I missing?
Thanks for your help - Jeff
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