Throttle Return Spring Kit - QFX Carbs

The Throttle Return Spring Kit for QFX carburetors is a precision dual-spring assembly engineered to restore proper throttle plate operation on Quick Fuel carb-equipped engines. Built from hardened steel with zinc oxide plating, this carburetor spring kit ensures consistent, repeatable throttle response by maintaining proper spring tension and preventing throttle blade sticking—a common wear issue on carbureted performance engines.

The dual-spring design provides balanced return force across the full throttle travel range, preventing hesitation during both idle and cruise conditions. Zinc oxide coating protects against corrosion in high-heat engine bay environments while maintaining the fatigue resistance needed for thousands of throttle cycles. The carb-mount configuration integrates seamlessly with Quick Fuel QFX carburetor platforms, delivering OEM-level fit without modification. At 0.34 lbs and compact enough to fit in standard carburetor compartments, this kit is designed for direct replacement of worn or damaged springs without removing the entire carburettor assembly.

This spring kit is essential for street and strip engine builders who rely on QFX carburetors for fuel delivery consistency. Whether rebuilding a carb after extended service or upgrading to fresh return springs as part of a complete carb refresh, this dual-spring assembly restores throttle response precision. Worn throttle return springs allow excessive blade play, resulting in erratic idle, poor cruise control, and unpredictable power delivery—issues easily resolved with this direct-fit replacement. Carburetor enthusiasts and vintage muscle car restorers regularly include this kit in complete carb overhauls to ensure responsive, predictable engine control.