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Upgrade your engine's performance with the HASTINGS Evolution Big Twin piston rings set, designed specifically for 3.498-inch bore sizes with a 0.005-inch gap. This comprehensive set includes top compression rings, second compression rings, and oil control rings, ensuring optimal sealing and efficiency in your motorcycle engine. 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 overall engine longevity. They also effectively control combustion chamber gases, facilitating efficient energy transfer from expanding gases to the crankshaft. The second compression rings incorporate a reverse torsional taper face that promotes side sealing, preventing oil from being forced under or behind the ring, which results in better oil economy and cleaner combustion. The reverse twist along with a taper-machined face replicates the scraping edge of a positive twist torsional ring, further enhancing sealing performance. The oil control rings are a three-piece flex vent design that allows for a smaller cross-sectional area, enabling better conformability to the bore and more uniform pressure distribution. This design includes four steel rails and two expanders, providing reliable oil control and reducing oil consumption. Made in the USA, these rings are crafted with precision to match the thermal conductivity and design specifications of KB pistons. Proper installation is critical, especially for the top ring, so please follow the instructions provided with your piston for correct ring end gap and installation procedures. This set includes enough rings for two pistons, with two rings per groove (except for the rails, which are paired with one expander ring). Enhance your engine’s performance, efficiency, and durability with this high-quality piston rings set from HASTINGS, built for demanding Big Twin applications.
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