Reply to "Carb Mixture Screw Tuning"

Stan Galat

Regarding the "best lean idle", the car has to be up to operating temperature or you're just going to be chasing your tail.

Turn the adjustment screws in until the engine starts to stumble, then back out at least 1/2 turn. If it bucks and farts and sneezes etc. when cold, I give them all 1/4 turn out more. I'll keep going until it'll idle after a couple of minutes of warming up - but no more than a turn or a turn and a quarter from the stumble. If it takes more, I move up a size (or a half-size) in the idle jets.

Regarding the state of tune with your engine: 95% of all carburation problems are ignition. What's your total timing? Is the advance curve stable? Do you have scatter?

5/10/213:25 PM

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