Stu
May I add to what Sid advised. The idle screws are
screwed in and then back out about 1 1/2 turns as
a starting point. Then with a warm engine and idle
speed of about 600-700 rpm use a vacuum gauge
to achieve maximum idle for each screw. You can
temporarily use the PCV vacuum port at the base
to attach the gauge. The result should be a very
smooth idle. Once you get the maximum idle for
each screw, turn it back in about 1/4 turn. Too lean
(screws out) makes the engine run hot and may
eventually burn a valve if you idle a lot. To rich
(screws in) may carbon up the engine. But this
can be cured but a quick run on the expressway.
The hole on top of the bowl is a vent hole. As long
as you have one, you're OK. The vent prevents
hot gas vapor from building up pressure and blowing
seals after shutting down with a hot engine.
Dave Johnson, B382002668, Aurora, IL
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