Piston Spring (Light Blue & Red) | AUC 4818

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Genuine SU piston spring — Light Blue & Red. Spring weight: light/heavy combination. The piston spring controls the rate at which the piston rises in response to airflow. Spring se lection affects mixture richness and throttle response — choose the correct colour for your application. Manufactured by Burlen to original SU specification. Part Number: AUC 4818 Show more