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The HASTINGS 2M6482030 piston rings set is designed for 74-inch Big Twin engines, providing reliable sealing and optimal performance. This set includes top compression rings, second compression rings, and oil control rings, ensuring comprehensive coverage for your engine's piston assembly. The top compression rings feature a barrel face design that enhances heat transfer between the piston and cylinder wall, helping to maintain proper operating temperatures and improve engine longevity. These rings control combustion gases, efficiently transferring the energy of expanding gases to the crankshaft for smooth power delivery. The second compression rings have a reverse torsional taper face that promotes side sealing and prevents oil from leaking under and behind the rings, ultimately improving oil economy and reducing emissions. Their reverse twist combined with a taper-machined face replicates the scraping edge of a positive twist torsional ring, enhancing sealing performance. The oil control rings consist of a three-piece flex vent design, which allows for a smaller cross-sectional area, promoting better conformability to the cylinder bore. These rails distribute uniform pressure through four steel rails and two expanders, providing consistent oil control and preventing excess oil from entering the combustion chamber. Made in the USA, these rings are built to meet high standards of quality and durability. Special attention is required during installation due to the thermal conductivity and design of KB pistons; please consult the provided instructions to ensure correct top ring end gap. This set is sufficient for two pistons, with two rings per groove—except for the oil control rails, which include two rails per expander. Designed for professional and DIY engine rebuilds, these piston rings will help restore engine compression and efficiency, contributing to the overall performance and longevity of your Big Twin motorcycle engine.
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