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Upgrade your motorcycle engine with the HASTINGS Evolution Big Twin piston ring set designed for optimal performance and durability. This comprehensive set includes top compression rings, second compression rings, and oil control rings, ensuring complete sealing and efficient engine operation. The top compression rings feature a barrel face that facilitates heat transfer between the piston and cylinder wall, helping maintain optimal operating temperatures and preventing overheating. These rings also effectively control combustion gases, transferring energy from expanding gases to the crankshaft for improved power output. The second compression rings are reverse torsional taper face rings that promote side sealing, preventing oil from passing under or behind the rings. This design enhances oil economy while maintaining proper sealing integrity. Additionally, the taper-machined face of these rings mimics the scraping edge of positive twist torsional rings, further improving sealing performance. The oil control rings utilize a three-piece flex vent design, which allows the rails to conform better to the cylinder bore for consistent oil regulation. This design provides uniform pressure across the rails with two steel rails and two expanders, ensuring reliable oil control and reducing oil consumption. Constructed in the USA, these rings are engineered for durability and precision. Due to the thermal conductivity characteristics of KB pistons, special attention must be paid to the top ring end gap during installation; detailed instructions are provided with the piston for proper assembly. This set is designed to fit two pistons, with two rings per groove, excluding the rails which are paired with expanders for optimal performance. Whether rebuilding or upgrading, this piston ring set offers reliable quality and performance tailored for Evolution Big Twin engines, making it an excellent choice for professional mechanics and DIY enthusiasts alike.
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