This piston ring kit is a high-quality aftermarket replacement designed for the 250-class four-stroke ATV family, covering EX and Recon variants across a broad range of years. It restores compression and reduces oil consumption by delivering a precise seal that stands up to heat and wear. The OS 0.50 specification offers a reliable balance of sealing performance and longevity, making it a practical upgrade when refreshing aging engines without paying OEM prices. Built for rugged trail work and farm use, this set helps bring your engine back to dependable, factory-like performance.

These rings address the most common wear issues on the 250 family—loss of compression, blue smoke, and increased oil burn—while delivering a durable, easy-to-install aftermarket solution for trail and farm duty. The OS 0.50 configuration provides proven sealing reliability, so you can trust this kit to restore power and reduce oil consumption without sacrificing longevity. It’s a direct-fit choice that keeps your machine running smoothly through long days in the dirt and mud.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

This kit contains the essential piston ring components needed to restore compression on the TRX 250 engine family. In the box you’ll find: Top compression ring, Second compression ring, Oil control ring.

Note: Piston, wrist pin, circlips, and related hardware are not included. Gaskets, seals, and the piston itself are sold separately as required for your rebuild.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Engineered to drop into TRX 250 EX (1997-2014) and Recon (1997-2022) platforms with minimal fuss.
• OEM Cross-Reference Alignment: Matches Honda’s ring-set families (13031-HM8-003 and related OS variants) for reliable interchangeability.
• Premium Materials: Chrome-faced top ring, molybdenum-faced second ring, and a robust oil ring deliver durable sealing under heat and wear.
• OS 0.50 Sealing Power: Balanced longevity and compression restoration for everyday trail and farm use.
• Performance Restoration: Restores lost compression and reduces oil burn, helping to eliminate blue smoke and power fades.
• Cost-Effective Upgrade: Delivers OEM-like performance without the OEM price tag, ideal for budget-conscious rebuilds.

Installation Notes:

• Begin with a thorough bore and ring-groove inspection; replace any worn or damaged grooves before installing the new rings.
• Confirm end gaps are at 0.50 mm (OS) and rotate gaps to distribute oil- and compression-sealing duties across the bore.
• Lubricate all rings and the bore with assembly lube or clean engine oil before assembly.
• Install rings in the correct order: top compression ring, second compression ring, then oil control ring; keep ring gaps offset from each other by at least 120 degrees.
• Use a proper piston-ring compression tool to avoid ring deformation during installation into the cylinder.
• Check piston orientation and ensure the ring grooves and piston markings align with the cylinder’s orientation marks before final assembly.

Why Upgrade?

Running a worn piston-ring set on a TRX 250 can lead to persistent compression loss, excessive oil consumption, blue smoke, and degraded idle and top-end power. Replacing with this OS 0.50 kit restores compression integrity and reduces oil burn, bringing the engine back toward factory-like performance and reliability for everyday trail work or farm tasks.