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The HASTINGS 2M6127030 piston rings are designed to optimize engine performance for Big Twin motorcycles with a 3.498-inch bore and a 0.030-inch oversize. This set includes top compression rings, second compression rings, and oil control rings, providing comprehensive sealing and efficient operation. The top compression rings feature a barrel face design that enhances heat transfer between the piston and cylinder wall, helping to maintain optimal operating temperatures and reduce the risk of piston overheating. They also effectively control combustion gases, enabling better energy transfer to the crankshaft for improved engine power and efficiency. The second compression rings are reverse torsional taper face rings that promote side sealing, preventing oil from passing under or behind the ring, which contributes to improved oil economy and cleaner combustion. Their reverse twist and taper-machined face replicate the scraping edge of positive twist torsional rings, ensuring a tight seal and reducing blow-by. The oil control rings are a three-piece flex vent design, allowing the rails to be manufactured with a small cross-sectional area for better conformability to the cylinder bore. This design provides uniform pressure through four steel rails and two expanders, ensuring reliable oil control and reducing oil consumption. Made in the USA, these rings are engineered to meet high standards of quality and durability. Special attention should be paid to the top ring end gap during installation, as the thermal conductivity and design of KB pistons require precise fitting for optimal performance. This set supplies enough rings to service two pistons, with two rings per groove, and includes the necessary components for effective sealing and oil control. Whether rebuilding or maintaining your Big Twin engine, these Hastings piston rings are crafted to deliver dependable performance and longevity.
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