Piston Kit OS 1.50 - Honda TRX 450 1998 2004 OEM Replacement
Piston Kit OS 1.50 - Honda TRX 450 1998 2004 OEM Replacement is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping info
- 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.
- Large equipment including international orders are subject to different delivery rates and timescales.
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Piston Kit OS 1.50 - Honda TRX 450 1998 2004 OEM Replacement is backordered and will ship as soon as it is back in stock.
Restore power and reliability to your Honda TRX450 with the OS 1.50 Piston Kit. Engineered for the 1998 - 2004 TRX450S Sportrax and the Foreman 4x4 family (S/ES/FE/FM), this oversize kit brings worn bores back to optimal clearance for crisp combustion and lasting durability. The kit includes a forged aluminum piston, complete ring set, wrist pin, and circlips to deliver a dependable top-end rebuild that feels like new power on demanding trail or farm runs. The +1.50 mm oversize is designed to restore compression when cylinders show bore wear, ensuring consistent performance under load.
Designed for rugged in-field use, this aftermarket replacement leverages a forged aluminum piston to handle the heat and stress of heavy ATV use, delivering reliable power delivery during climbs, towing, or long trail days. It addresses worn rings and reduced sealing from cylinder wear, offering a cost-effective alternative to OEM replacements while preserving OEM-like performance and clearances for durable, predictable operation. Perfect for trail riders and farm work alike, it’s built to endure harsh conditions where a worn piston would otherwise sap performance and reliability.
What's Included
Each box contains the components below to complete a precise top-end rebuild.
- Piston
- Rings
- Wrist Pin
- Circlips
Note: Gaskets, seals, and other cylinder head components are not included in this kit.
OEM & Aftermarket Cross-Reference Information
| Part Number | Brand / Type | Cross-Reference Notes |
|---|---|---|
| 01.1498.150 | Honda OEM Cross-Reference (OS Oversize) | Cross-references to Honda TRX450 piston assemblies; aligns with bore oversize +1.50 mm for 1998 - 2004 models. Includes references to OEM numbers such as 13010-HN0-A01 / 13010-HN0-A02 / 13101-HN0-A00 / 13111-HN0-A00 / 13112-MAT-000. |
| 01.1498.000 | Honda OEM Cross-Reference (Standard Bore) | Standard-bore reference for TRX450 engines of the same generation; aligns with OEM cross-references listed above as applicable to stock bore restorations. |
Fitment
| Manufacturer | Models / Series | Years / Details |
|---|---|---|
| Honda | TRX450S Sportrax | 1998 - 2004 |
| Honda | TRX450ES Foreman 4x4 | 1998 - 2004 |
| Honda | TRX450FE Foreman 4x4 ES | 1998 - 2004 |
| Honda | TRX450FM Foreman 4x4 S | 1998 - 2004 |
Specifications
| Attribute | Details |
|---|---|
| OEM Reference Part Numbers | 01.1498.150 (OS oversize), 01.1498.000 (standard bore) |
| Type | Piston Kit |
| Manufacturer | Aftermarket Replacement |
| Application | Honda TRX450S/ES/FE/FM 1998 - 2004 |
| Material | Forged Aluminum Alloy |
| Bore Size | 91.50 mm |
| Oversize | +1.50 mm |
| Displacement | 432 cc |
| Compression Ratio | 9.5:1 |
| Engine Type | 4-stroke |
| Includes | Piston, Rings, Wrist Pin, Circlips |
Installation Notes
- Verify cylinder bore size before ordering; oversize +1.50 mm requires a corresponding bore rework to 91.50 mm for proper fit.
- Measure and confirm piston orientation markings (arrow) align with the engine’s forward direction during assembly.
- Use appropriate engine assembly lube on the piston skirts and rings to prevent dry start and scuffing.
- Inspect the cylinder for wear or scoring; de-glaze or re-bore as needed to achieve true roundness and crosshatch finish.
- Install the piston rings with correct orientation and staggered gaps; ensure ring end gaps do not align across the engine.
- Install the wrist pin and secure with the circlips, confirming proper retention before final assembly and torque procedures for surrounding components (cylinder head, crankcases, etc.).
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