Piston Kit OS 0.50 - Honda TRX350 (2000-2006)
Piston Kit OS 0.50 - Honda TRX350 (2000-2006) 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 0.50 - Honda TRX350 (2000-2006) is backordered and will ship as soon as it is back in stock.
OS 0.50 Piston Kit for Honda TRX350 Rancher (2000 - 2006) is a purpose-built aftermarket replacement designed to restore compression and power across the full TRX350 generation. The 0.50 mm oversize bore targets the standard TRX350 cylinder (79.00 mm) to deliver reliable top-end performance and durable sealing during a proper rebuild of the piston, rings, and seating surfaces. This kit is engineered as a direct, OE-style substitute from Aftermarket Replacement, offering factory-like fit and long-lasting durability without OEM branding.
Built for trail and farm work alike, this OS 0.50 kit addresses common wear: ring gaps close, rings lose tension, and compression slowly declines with miles of tough riding. The forged MOS2-coated piston and precisely machined components are chosen to maintain oil control and heat management under heavy loads, making it a dependable choice for Rancher engines that see regular hard use or extended hill climbs.
What's Included
This piston kit is designed for a precise top-end rebuild and includes the essential components required to restore compression and performance in the TRX350 family.
- Piston (0.50 mm oversize, MoS2-coated, forged aluminum)
- Rings (ring pack matched to bore and oversize)
- Piston Pin
- Circlips
Gaskets, seals, and other related hardware are not included and should be sourced separately per service manual requirements.
OEM & Aftermarket Cross-Reference Information
| Part Number | Brand / Type | Cross-Reference Notes |
|---|---|---|
| 13103-HN5-670 | Honda OEM | Direct OEM reference mapped to this OS 0.50 piston kit |
| 01.1480.050 | Pro-X | OEM Replacement; bore 79.00 mm; 0.50 mm oversize; cross-references to multiple Honda OEM numbers in catalogues |
| 13101-HN5-670 | Honda OEM | Alternate OEM reference used for similar 0.50 oversize kits |
| 4933M07950 | Wiseco | 79.50 mm oversize kit for TRX350 Rancher; cross-reference to 79.50 mm bore variants |
| 8871D050 | Wossner | 79.00 mm OS 0.50 piston kit; cross-reference to other oversizes in TRX350 line |
Fitment
| Manufacturer | Models / Series | Years / Details |
|---|---|---|
| Honda | TRX-FM / FE 350 Rancher (TRX350FM / TRX350FE) | 2000 - 2006 |
| Honda | TRX-TM / TE 350 Rancher (TRX350TM / TRX350TE) | 2000 - 2006 |
| Honda | TRX350FE Rancher ES 4x4 | 2000 - 2006 |
| Honda | TRX350FM Rancher 4x4 | 2000 - 2006 |
| Honda | TRX350TE Rancher ES 4x4 | 2000 - 2006 |
| Honda | TRX350TM Rancher 4x4 | 2000 - 2006 |
Specifications
| Attribute | Details |
|---|---|
| OEM Reference Part Numbers | 13103-HN5-670 |
| Type | Piston Kit (0.50 mm oversize) |
| Manufacturer | Aftermarket Replacement |
| Application | Honda TRX350 Rancher 2000 - 2006 (TRX350FM/FE 4x4; TRX350TM/TE 2x4) |
| Bore | 79.00 mm (0.50 mm over standard) |
| Oversize | +0.50 mm |
| Material / Construction | Forged aluminum with MoS2 coating |
| Coating | MoS2 (molybdenum disulfide) |
| Fitment Years | 2000 - 2006 |
Installation Notes
- Thoroughly clean the cylinder bore and inspect for scoring before install; remove any burrs to ensure a proper seal.
- Verify bore size is exactly 79.00 mm and confirm the oversize is +0.50 mm to match the piston kit specification.
- Install rings with properly staggered end gaps to avoid compression leaks and blow-by; ensure correct orientation relative to front/back of the engine.
- Lubricate the piston, rings, and wrist pin with assembly lube prior to final assembly to prevent dry start.
- Install circlips securely and verify the wrist pin is captive; avoid bending or twisting during fitment.
- Follow the TRX350 service manual for torque specs and head/connecting rod fasteners during reassembly; perform a careful break-in procedure after start-up.
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