HASTINGS Replacement Piston Rings — Bore 3.437", Oversize +0.030" – 41-47, 49-80 Big Twin, 80 Touring

Complete replacement piston ring kit that includes top compression rings, second compression rings, and three-piece oil control rings for two pistons.

Top compression rings are barrel face to improve contact and sealing, aiding heat transfer between the piston and cylinder wall and helping control combustion gases so the piston can transfer energy to the crankshaft.

Second compression rings feature a reverse torsional taper face to promote side sealing and better oil economy, with a reverse-twist and taper-machined face that duplicates the bottom-side scraping edge of a positive twist torsional ring.

Oil control rings are a three-piece flex vent design: two steel rails and an expander provide uniform pressure and positive oil control while the thin rail cross section allows superior bore conformability.

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

Made in the USA. Due to thermal conductivity and KB piston design, pay special attention to the top ring end gap; follow the piston instructions for correct installation.

Kit includes:

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