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Upgrade your engine's performance with the HASTINGS Evolution Big Twin Piston Rings, designed specifically for 3.498-inch diameter pistons with a +0.020-inch oversize. These high-quality rings are engineered to optimize heat transfer, improve oil control, and enhance combustion efficiency, ensuring your motorcycle runs smoothly and reliably. Crafted with precision, this set includes top compression rings, second compression rings, and oil control rings, providing all the necessary components for a complete piston ring replacement.
HASTINGS's top compression rings feature a barrel face with a cast coating, which facilitates efficient heat transfer between the piston and cylinder wall. This design helps maintain optimal operating temperatures, reducing the risk of piston overheating and extending engine life. The second compression rings are reverse torsional taper face rings, promoting excellent side sealing that prevents oil from leaking under and behind the ring, thereby improving oil economy and minimizing emissions. These rings work together to ensure that combustion gases are effectively contained, maximizing power output.
The oil control rings are a three-piece flex vent design, allowing the rails to conform better to the bore for consistent oil regulation. The four steel rails and two expanders maintain uniform pressure, providing superior oil control and reducing oil consumption. Made in the USA, this piston ring set is built for durability and precision, offering reliable performance under demanding conditions. Each set includes enough rings for two pistons, with two rings per groove—except for the rails, which are supplied as two rail rings per one expander ring. Ideal for Big Twin motorcycles, these rings are a perfect choice for restoring or upgrading your engine's efficiency and longevity.
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