4050XZ Ring Set 40.50mm for Wiseco Pistons

Ring Set for Wiseco

This 40.50mm piston ring set is a replacement ring package designed to seal the combustion chamber and control oil on pistons sized to 40.50mm, and it references Wiseco part number 4050XZ.

Overview

The Wiseco 4050XZ ring set is a 40.50mm piston ring package built to restore compression and oil control on a worn or rebuilt top end. Each set delivers the rings needed for one piston at the stated bore size, making it a direct service part for rebuilds and refresh work. Riders and engine builders choose this 40.50mm ring set when they need fresh sealing rings matched to a 40.50mm piston.

Built For Performance

• Ring set sized for a 40.50mm piston bore
• Wiseco part number 4050XZ stamped for identification
• Rings engineered for compression sealing and oil control
• Suited to high-rpm small bore engine builds
• Sold as a complete ring package for one piston

Fits These Machines

• for machines running a 40.50mm bore piston
• for engines rebuilt with Wiseco 40.50mm pistons
• for small bore two-stroke and four-stroke top ends at 40.50mm

On-The-Job Use

• Top end rebuilds where the piston is replaced or refreshed
• Ring replacement during a cylinder hone or re-plate service
• Race engine assembly requiring matched ring end gaps
• Routine maintenance on high-hour small bore engines

Specs At A Glance

Good To Know

Q: How do I know this ring set matches my piston? A: Confirm your piston is sized for a 40.50mm bore and that the ring grooves accept this ring package before ordering. The part number 4050XZ should match the piston's recommended ring set.

Q: Are ring end gaps pre-set out of the box? A: Ring end gaps typically need to be checked and filed to the piston maker's specification for your application. Always verify gap clearance during assembly.

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