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Upgrade your motorcycle engine with the HASTINGS Evolution Big Twin Piston Rings set, designed specifically for 3.498-inch bore and a 0.030-inch piston gap. This comprehensive set includes top compression rings, second compression rings, and oil control rings, ensuring optimal engine performance and longevity. 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 efficiency. They also control combustion gases, transferring the energy from expanding gases to the crankshaft for smooth power delivery. The second compression rings are reverse torsional taper face rings that promote side sealing, reducing oil consumption by preventing oil from passing beneath or behind the ring. Their reverse twist and taper-machined face replicate the scraping edge characteristic of positive twist torsional rings, providing effective sealing and reducing blow-by. The oil control rings are a three-piece flex vent design, allowing for a smaller cross-sectional area that conforms better to the cylinder bore. This design ensures uniform pressure across four steel rails and two expanders, delivering superior oil control and reducing oil consumption. Manufactured in the USA, these rings are built to high standards of quality and durability. Proper installation is critical due to the thermal conductivity and design of KB pistons, and it is recommended to follow the instructions provided with the piston for correct ring end gap setup. This set includes enough rings for two pistons, with two rings per groove, except for the rails which come with two rail rings per one expander ring. Whether you're rebuilding or upgrading, these piston rings are engineered to deliver reliable performance and efficient sealing for your Big Twin engine.
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