Restore compression and curb oil consumption with a piston ring kit OS 1.00, a direct-fit, OEM-equivalent replacement designed for Honda TRX 250 engines. This kit covers the Honda TRX 250 EX (Sportrax) from 1997 through 2014 and the TRX Recon (FourTrax) from 1997 through 2022, delivering reliable sealing and improved power on every trail or field task. Engineered to restore ring sealing and oil control, it helps your TRX maintain steady performance under load and across heat cycles.

Built for rugged use on trails and farms, the OS 1.00 rings address common wear such as worn ring sealing, increased oil consumption, and compression drop. The kit’s chromium-faced ring faces and high-grade alloy steel construction are designed for durability in dusty, hot environments, making it a dependable aftermarket choice when rings wear and compression suffers during hard use.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

Each box contains the essential rings needed to restore compression on a single cylinder:

• Top compression ring (OS 1.00)
• Second compression ring (OS 1.00)
• Oil control ring (OS 1.00)

Note: This kit does not include the piston itself, wrist pin, circlips, or base/gasket components.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely matched to Honda TRX 250 EX and TRX Recon engines for straightforward installation.
• OEM Cross-Reference: Alignment with Honda references ensures reliable interchange within OEM catalogs and aftermarket listings.
• Premium OS 1.00 Materials: Oversize restoration with chromium-faced faces for enhanced sealing and oil control.
• Performance Restoration: Reclaims compression, throttle response, and fuel efficiency by eliminating ring-land leakage.
• Rugged Durability: Built to endure trail and farm conditions where dust, heat, and repeated load cycles are common.
• Single-Cylinder Focus: Packaged as a complete ring set for one cylinder, simplifying maintenance planning and installation.

Installation Notes:

• Inspect the cylinder bore for scoring or excessive wear; micrometer readings and a proper pline check guide recondition the cylinder if needed.
• Verify end-gap and compatibility with OS 1.00 rings according to the service manual; improper gaps can cause ring sticking or leakage.
• Clean all ring grooves, piston's lateral surfaces, and the ring lands thoroughly to remove carbon and debris before installation.
• Lightly lubricate all rings with clean engine oil before placement to prevent ring stalling during initial rotation.
• Install rings in the correct order (top compression, second compression, then oil ring) and align the gaps to minimize blow-by across the piston crown.
• After installation, perform a careful break-in procedure and verify compression and oil control during the initial warm-up cycle.

Why Upgrade?

Worn piston rings can allow cylinder wear and oil intrusion to degrade compression, throttle response, and overall reliability. Replacing with this OS 1.00 ring kit restores proper sealing and oil control, returning your Honda TRX to dependable performance in demanding trail and farm conditions.