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webers

I just installed a new set of 48 Ida Webers. I have not begun to balance them because on initial startup I get a loud knocking sound. I cranked the motor with coil wire removed, no knocking. It does not sound like the knocking is coming from the motor but rather from one or more of the carbs. What might be the problem? I've had webers on the car for years, my old ones never did this.

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