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Off Idle Mixture Adjustment with a Vacuum Gauge

fleshy1

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I have a somewhat SMOG legal ZS setup on my 1978 'B that I've been trying to get tuned without the aid of a gas analyizer. I know the analyzer is the way to go, but it's not in my budget.

I've been trying to set the mixture at idle with a vacuum gauge but the needle buzzes and it's had to tell if my adjustment is actually having an effect. I thought about it and figured that because the ZS just has a single jet setting mixture off idle (2000 rpms) would work. The needle is much more stable at that RPM and I am really able to gauge the effect of an adjustment.

Are my assumptions good? Will I get a better mix throughout the RPM range since the idle circuit is less of a factor at higher RPMS?

Thanks for you opinions...
 
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