HASTINGS Replacement Piston Rings — 3.437\" bore, +0.040\" oversize – 41-47, 49-64, 70-80 Big Twin, 80 Touring

Replacement piston rings engineered for performance, sealing, and oil control. 🔧

• Includes top compression rings (barrel face), second compression rings (reverse torsional taper face), and oil control rings (three-piece flex vent).
• Helps transfer heat between the piston and cylinder wall and controls combustion gases to transfer power to the crankshaft.
• Second compression ring design promotes side sealing to prevent oil from being forced under the ring for improved oil economy.
• Three-piece oil control design uses four steel rails and two expanders to provide uniform pressure and positive oil control.
• Includes enough rings for two pistons; two rings per groove, except rails where there are two rails per expander.

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

Please read the instructions furnished with the piston for correct top ring end gap and installation.

Made in the USA. 🇺🇸