HASTINGS Replacement Piston Rings — Bore 3.437" – 41-47, 49-64, 70-80 Big Twin, 80 Touring

Includes top compression rings, second compression rings, and oil control rings. 🔧

Top compression rings are barrel face and help transfer heat between the piston and cylinder wall. 🔥

Second compression rings are reverse torsional taper face to promote side sealing and prevent oil from being forced under and behind the ring, improving oil economy.

Reverse twist ring with a taper-machined ring face duplicates the OD bottom-side scraping edge of a positive twist torsional ring.

Oil control rings are a three-piece flex vent design that provides uniform pressure through four steel rails and two expanders for positive oil control. 🛠️

Includes enough rings for two pistons; two rings per groove except for the rails that use two rail rings per one expander ring.

Due to the thermal conductivity and design of KB pistons, special attention is required to the top ring end gap — please read the instructions furnished with the piston for correct ring installation. 🇺🇸