I have a 72 Demon with the Holly 1920 carb on it. I have had it for over 10 years and it has always done well on the emmissions tests.

I had it tested today and it just barely passed the Carbon Monoxide test. It is supposed to be a max of 7% and its reading was 6.05%. (This is an idle test only). In the past it has been 1 to 2%.

I am thinking that I need to adjust the idle mixture to lean it out. What I can't remember is which way to turn the screw to lean the mixture. Does anyone know? Also, any other suggestions for the high number?

Thanks

turn it in (clockwise, that is) to lean it out...
I use to turn it in 'til the engine stumbled, then back it out a half turn
now I use a vacuum gauge, going for highest manifold vacuum at correct rpm...

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