HASTINGS Replacement Piston Rings — Bore 3.437" , Oversize +0.010" – 41-47, 49-80 Big Twin, 80 Touring

Replacement piston ring set engineered for reliable sealing, oil control, and heat transfer. 🛠️

• Includes top compression rings, second compression rings, and three-piece oil control rings.
• Top compression rings are barrel face to improve sealing and assist heat transfer between piston and cylinder wall.
• Second compression rings feature a reverse torsional taper face to promote side sealing and better oil economy.
• Three-piece flex vent oil control rings provide uniform pressure via four steel rails and two expanders for positive oil control.
• Reverse twist and taper-machined faces duplicate the OD bottom-side scraping edge of positive twist torsional rings.
• Includes enough rings for two pistons; two rings per groove except rails where two rails are provided per expander.

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

Kit includes:

• 2x Top compression rings 0.0625"
• 2x Second compression rings 0.0625"
• 2x Expander rings
• 4x Steel rails