3218X Ring Set 3.918in for Wiseco Piston Rings

Ring Set for Wiseco

This Wiseco 3218X ring set measures 3.918in. and is made to seal the piston-to-cylinder gap in high-compression four-stroke engines.

Overview

This Wiseco ring set gives you a fresh top-end seal for a piston measuring 3.918in. in bore size. The 3218X ring set is aimed at riders and builders doing a rebuild who want correct end gap and solid compression. Each ring set is boxed as a matched set for the listed bore size.

Built For Performance

• 3.918in. nominal bore size for a precise fit
• Matched ring set for consistent sealing across the piston
• Intended for high-compression four-stroke applications
• Suited to rebuilds and top-end refreshes
• Sold as a set for one piston

On-The-Job Use

• Top-end rebuilds on high-performance four-stroke engines
• Piston replacement during a cylinder service
• Restoring compression on a worn or smoking engine
• Race engine assembly where ring seal matters

Specs At A Glance

Good To Know

Q: How do I know this ring set fits my piston? A: Match the 3.918in. bore size and the 3218X part number against your piston or build sheet before ordering. Ring sets are sized to a specific bore, so a different bore size needs a different set.

Q: Can I reuse my old rings with a new piston? A: New rings should be fitted with a new or freshly honed cylinder for the best seal. Reusing worn rings on a fresh bore usually costs compression and oil control.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.