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

Complete replacement piston ring kit designed to restore sealing and oil control in the combustion chamber. 🔧

• Includes top compression rings, second compression rings, and oil control rings.
• Top compression rings are barrel face; second compression rings are reverse torsional taper face to promote side sealing.
• Oil control rings are three-piece flex vent, providing uniform pressure through four steel rails and two expanders for positive oil control.
• Helps heat transfer between the piston and cylinder wall and controls combustion gases for efficient power transfer to the crankshaft.
• Includes enough rings for two pistons; two rings per groove except rails, which use two rails per one expander.
• Due to thermal conductivity and piston design, special attention is required to top ring end gap — please read instructions furnished with piston for correct installation. ℹ️
• Made in the USA. 🇺🇸

Kit includes:

• 2x Top Compression Rings 0.0625"
• 2x Second Compression Rings 0.0625"
• 2x Expander Rings
• 4x Steel Rails