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

Replacement piston ring kit includes top compression rings, second compression rings, and three-piece oil control rings for two pistons. 🛠️

• Top compression rings are barrel face to aid heat transfer between the piston and cylinder wall and improve sealing of combustion gases.
• Second compression rings feature a reverse torsional taper face to promote side sealing and better oil economy.
• Reverse twist design 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 with two expanders and four steel rails to provide uniform pressure and positive oil control.
• Two rings per groove, except the rails which use two rail rings per one expander ring; kit includes enough rings for two pistons.
• Made in the USA.
• Important: due to the thermal conductivity and design of KB pistons, special attention is required to the top ring end gap; read the piston instructions for correct ring installation.

Kit includes: 2x Top Compression Rings 0.0625", 2x Second Compression Rings 0.0625", 2x Expander Rings, 4x Steel Rails.