OS 0.25 High Quality Piston Ring Kit for Honda TRX 250 EX 1997 2014 and TRX Recon 1997 2022
OS 0.25 High Quality Piston Ring Kit for Honda TRX 250 EX 1997 2014 and TRX Recon 1997 2022 is backordered and will ship as soon as it is back in stock.
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- Standard delivery (2-4 working days) - £4.99 on eligible UK mainland orders under £50.
- Express delivery - £6.99 on eligible UK mainland orders placed before 2pm.
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OS 0.25 High Quality Piston Ring Kit for Honda TRX 250 EX 1997 2014...
The OS 0.25 oversize piston ring kit is a purpose-built engine part designed for Honda TRX 250 platforms, specifically the TRX 250 EX (1997–2014) and the TRX Recon (1997–2022). This kit restores compression by replacing worn piston rings and helps reduce oil consumption, blown-by, and power loss on the trail or worksite. Built to exact Honda OE specifications, it delivers a dependable, cost-effective solution for field use where reliability matters most. When rings lose their seal, you’ll notice diminished power, smoky startup, and increased oil burn—the OS 0.25 kit is engineered to put those symptoms in the past and bring the engine back to peak performance.
Designed to tackle the common wear points that derail compression, this aftermarket set focuses on ring land wear and oil-control failures that creep in after hours of hard use. It provides a balanced three-ring seal (two compression rings and an oil ring) per piston, delivering consistent compression and proper oil management for demanding trail, farm, and utility duties. With a robust alloy/iron construction and Honda OE-spec fit, it’s a reliable choice when you need a durable, field-proven rebuild option without OEM pricing.
Comprehensive Vehicle Fitment
| Manufacturer | Models / Series | Years / Details |
|---|---|---|
| Honda | TRX 250 EX | 1997–2014 |
| Honda | TRX Recon | 1997–2022 |
Product Specifications
| Attribute | Details |
|---|---|
| OEM Reference Part Numbers | 13021-HM8-003 (OS 0.25); 13011-HM8-003 (STD) |
| Type | Piston Ring Kit (Over Size OS 0.25) |
| Manufacturer | Aftermarket Replacement |
| Application | Honda TRX 250 EX (1997–2014); TRX Recon (1997–2022) |
| Oversize | OS 0.25 mm |
| Ring Configuration | 3 rings per piston: 2 compression rings + 1 oil ring |
| Material | Engine-grade alloy steel / cast-iron components (Honda OE spec) |
OEM & Aftermarket Cross-Reference Information
| Part Number | Brand / Type | Cross-Reference Notes |
|---|---|---|
| 13021-HM8-003 | Honda OEM Piston Ring Set (OS 0.25) | Cross-reference to 13011-HM8-003 (STD); 13031-HM8-003 (OS 0.50); 13041-HM8-003 (OS 0.75); 13051-HM8-003 (OS 1.00) |
| 13011-HM8-003 | Honda OEM Piston Ring Set (STD) | Cross-reference to 13021-HM8-003 (OS 0.25); 13031-HM8-003 (OS 0.50); 13041-HM8-003 (OS 0.75); 13051-HM8-003 (OS 1.00) |
| 13031-HM8-003 | Honda OEM Piston Ring Set (OS 0.50) | Cross-reference to 13021-HM8-003; 13011-HM8-003; 13041-HM8-003; 13051-HM8-003 |
| 13041-HM8-003 | Honda OEM Piston Ring Set (OS 0.75) | Cross-reference to 13021-HM8-003; 13011-HM8-003; 13031-HM8-003; 13051-HM8-003 |
| 13051-HM8-003 | Honda OEM Piston Ring Set (OS 1.00) | Cross-reference to 13021-HM8-003; 13011-HM8-003; 13031-HM8-003; 13041-HM8-003 |
What's Included
In the box you’ll find the essential components to rebuild a single TRX 250 piston with OS 0.25 oversize rings. The package includes:
- Top Compression Ring
- Second Compression Ring
- Oil Ring
Note: Piston, circlips, circlip retainers, and gaskets are not included unless specified separately.
Why Choose This Aftermarket Replacement?
- Direct-Fit Compatibility — Precisely matched to Honda TRX 250 engines using OEM Honda references to ensure proper sealing and easy install.
- OEM Cross-Reference — Includes cross-reference options (STD and multiple OS variants) to help source the correct rings across model years.
- Premium Materials — Engine-grade alloy steel / cast-iron components built to Honda OE spec for durability under load.
- Complete Ring Configuration — Three rings per piston deliver balanced sealing and reliable oil control for demanding use.
- Performance Restoration — Restores compression, reduces oil consumption, and minimizes blow-by for renewed power and efficiency.
- Cost-Effective Reliability — A high-quality aftermarket option that matches OEM specifications at a lower price point.
Installation Notes:
- Inspect the cylinder bore and ring grooves for scoring or excessive wear; replace if the bore cannot be cleaned to spec.
- Use a proper piston ring expander to avoid nicking rings or scratching the bore; never twist rings during installation.
- Lubricate all rings and the piston with clean engine oil or assembly lube before installation; keep the bore clean and free of debris.
- Install the oil ring and the two compression rings in the correct order, ensuring orientation markers (if any) are observed.
- Stagger the ring end gaps on the piston to avoid a continuous gap line; use a piston ring compressor to seat the assembly evenly into the bore.
- Refer to the service manual for the exact end-gap specifications corresponding to the OS 0.25 bore and follow break-in procedures after installation.
Why Upgrade?
Running a worn piston-ring set leads to loss of compression, increased oil consumption, and higher blow-by, which reduces power and reliability. Replacing with this OS 0.25 oversize kit restores compression, improves oil control, and returns the ATV to confident, dependable performance on rough trails or busy jobsites.
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