400 low buck dont give a

Lonewolf3165 said

Carb size does matter in a build as does the way the secondaries are operated. Too big a carb & you'll lose efficiency.

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Exactly. Though it may be tuned to give proper fuel delivery, weak acceleration from a to large of a carb or in the case of a DP, open to soon is the same as to large.

You will have to regulate the secondary opening.