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So I got my new timing chain swapped in. She runs much smoother, and the first thing I noticed was I had lower the idle quite a bit. Not sure why, maybe the gear drive cause a lot more friction? I went to the parts store to pick up some exhaust manifold gaskets because the copper ones I have wont seal. One of the leaks melted a wire loom, so had to get it taken care of.
Anyway, on to my question. When I got back after getting her warmed up, I decided to check my vacuum reading. When I pulled the vacuum cap off the back of the carb, the idle increased to at least 1500 RPM from about 900, and stayed there. Shouldn't it peter out when the cap is pulled? The timing is still sitting at 18° at idle. I have the secondary butterflies open just slightly and the primary butterflies are only about 1 to 1 1/2 turns open with the idle screw. Does this mean I am running rich at idle?
Anyway, on to my question. When I got back after getting her warmed up, I decided to check my vacuum reading. When I pulled the vacuum cap off the back of the carb, the idle increased to at least 1500 RPM from about 900, and stayed there. Shouldn't it peter out when the cap is pulled? The timing is still sitting at 18° at idle. I have the secondary butterflies open just slightly and the primary butterflies are only about 1 to 1 1/2 turns open with the idle screw. Does this mean I am running rich at idle?