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I have had a vacuum gauge in all my cars, and know that at 10 Inches and below, the metering rods of a quad are full out and your running on your main jets.
I know the higher the reading theoretically the better the MPG, but for the pumping loses....
BUT that does not really tune the carb as good a FI system electronically controlled.
I know they used to super tune the carb and the timing systems but it took a lot of time and work...
And it was NOT cheap either.
Rich
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