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Old 08-06-2011, 12:54 PM
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If the carb doesn't have a working choke, it will backfire when cold, usually when you try to accelerate(any opening change in the throttle blade position). This is quite normal.

Increasing the size of the accelerator pump shot will lessen or remove the tendancy for it to backfire. Experiment with larger pump shooters(nozzle) or/and larger pump cams on a Holley carb.
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