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Upgrade your engine's performance with the HASTINGS piston rings designed specifically for 74-inch Big Twin motorcycles. This set includes top compression rings, second compression rings, and oil control rings, providing comprehensive sealing and efficiency. The top compression rings feature a barrel face, aiding in effective heat transfer from the piston to the cylinder wall, which helps maintain optimal operating temperatures and prevents overheating. These rings also control combustion gases, ensuring maximum energy transfer from the expanding gases to the crankshaft for improved power output. The second compression rings boast a reverse torsional taper face, promoting side sealing that reduces oil consumption by preventing oil from passing under or behind the rings. The reverse twist combined with a taper-machined face mimics the scraping edge of a positive twist torsional ring, enhancing sealing performance and engine longevity. The oil control rings are designed as a three-piece flex vent system, allowing the rails to be manufactured with a small cross-sectional area for better bore conformability. This design ensures uniform pressure through four steel rails and two expanders, providing effective oil control and reducing oil consumption. Made in the USA, these rings are crafted with precision to meet high standards of durability and performance. Due to the thermal conductivity and specific design of KB pistons, special attention is necessary when installing the top ring end gap; consulting the provided instructions is recommended to ensure proper installation. The package contains enough rings for two pistons, with two rings per groove and the rails paired with a single expander ring, offering a complete solution for your engine rebuild or upgrade. Whether restoring an older model or customizing a new build, these Hastings piston rings deliver reliable sealing, heat transfer, and oil control to optimize your motorcycle's performance and longevity.
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