Carb Mixture Screw Tuning

Hey Guys

I have a question as to which method of setting the Carb idle mixture screw is correct.

Most of the things I have seen say to set at best lean setting. Turn screw in until the engine stumbles then turn out 1/4 to 1/2 turn.

The Bob Tomlin Weber book says something a little different. Turn the screw in until the engine speed drops off. Then rotate screw out until the picks up speed and runs at its maximum best. I assume I would use a timing light to monitor the rpm increase with this method.

These are two totally different approaches.

Any thoughts?

5/10/217:40 AM

Original Post

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