HASTINGS Replacement Piston Rings — Bore 3.750" – 99-06 Touring, 00-06 Softail, 99-06 Dyna

Replacement piston rings engineered to restore compression, control oil, and improve piston-to-cylinder heat transfer. 🔧🇺🇸

Includes top compression rings, second compression rings, and oil control rings designed for reliable sealing and consistent performance.

• Top compression rings are barrel face for dependable seating.
• Second compression rings use a Napier profile with a reverse twist and taper-machined face to reproduce the OD bottom-side scraping edge of a torsional ring.
• Oil control rings are a three-piece Flex Vent design, providing uniform pressure through four steel rails and two expanders for positive oil control.

The design promotes side sealing to reduce oil migration and improve oil economy while aiding heat transfer from piston to cylinder wall.

Includes enough rings for two pistons, with two rings per groove except the rails where two rail rings use a single expander.

Kit includes:

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