Carburetor Tuning 201
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If you run a vacuum secondary carburetor and you notice the engine falling on its face near the halfway point on the gas pedal, where the secondaries should open, check your spring. Too light of a spring can cause the butterfly to open too early before there is enough vacuum to draw fuel through the secondaries and too heavy of a spring can cause the butterfly to stay closed past the ability of the primary jets to deliver enough fuel. View Related Article
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