GOOFIT
89mm 440cc Big Bore Cylinder Kit for Honda XR400R TRX400EX TRX400X
89mm 440cc Big Bore Cylinder Kit for Honda XR400R TRX400EX TRX400X
No se pudo cargar la disponibilidad de retiro
Product Overview
Upgrade or rebuild your compatible Honda 400cc engine with this 89mm big bore cylinder and piston kit, designed for selected XR400R, TRX400EX, and TRX400X applications.
Featuring an enlarged 89mm cylinder bore, this kit is commonly marketed as a 440cc big bore conversion for compatible Honda 400-series engines. The kit includes the cylinder, matched piston components, gaskets, and spark plug needed for a top-end installation.
This is a big bore modification kit, not a standard-bore OEM replacement cylinder. Engine setup, clearances, fuel delivery, and other supporting components should be checked during installation.
Product Compatibility
| Make | Model | Year Range | Application |
|---|---|---|---|
| Honda | XR400R | 1996–2004 | 89mm Big Bore Conversion |
| Honda | TRX400EX Sportrax / 400EX | 1999–2008 | 89mm Big Bore Conversion |
| Honda | TRX400X | 2009 | 89mm Big Bore Conversion |
| Honda | TRX400X | 2012–2014 | 89mm Big Bore Conversion |
Note: TRX400X model years 2010–2011 are not included in the listed application range.
Fitment should be confirmed by model, year, cylinder configuration, mounting dimensions, and original engine components before ordering.
OEM Cross-Reference Numbers
Honda Cylinder Reference
- 12100-HN1-A70
This aftermarket 89mm big bore cylinder is not an OEM-standard-bore cylinder. The OEM number above should be treated as an application/reference number rather than a claim that the 89mm cylinder has original Honda bore specifications.
Specifications
| Specification | Details |
|---|---|
| Product Type | Big Bore Cylinder & Piston Kit |
| Application | ATV / Off-Road Motorcycle |
| Engine Type | 4-Stroke |
| Cylinder Bore | 89 mm / 3.50 in |
| Marketed Displacement | 440cc Big Bore |
| Original Engine Class | 400cc |
| Listed Mounting Distances | Approx. 87 × 80 × 90 × 80 mm |
| Inch Equivalents | Approx. 3.43 × 3.15 × 3.54 × 3.15 in |
| Cylinder Design | Enlarged Sleeve / Big Bore |
| Condition | New |
Key Features
- 89mm Big Bore: Enlarged cylinder bore for compatible Honda XR400R, TRX400EX, and TRX400X engines.
- 440cc-Class Conversion: Commonly marketed as a 440cc upgrade from the original 400cc engine configuration.
- Matched Top-End Components: Includes cylinder, piston components, gaskets, and spark plug for a compatible installation.
- Larger Cylinder Sleeve: Designed specifically for the increased 89mm bore configuration.
- Multiple Honda Applications: Covers selected XR400R, TRX400EX, and TRX400X model years.
Compartir
Preguntas frecuentes sobre compatibilidad
¿Esta pieza es compatible con mi modelo y año específicos?
This 89mm big bore kit is listed for:
Honda XR400R: 1996–2004
Honda TRX400EX: 1999–2008
Honda TRX400X: 2009, 2012–2014
Confirm the exact model, year, engine configuration, and cylinder dimensions before ordering.
¿Necesito que coincida el número de pieza OEM?
The listed Honda cylinder reference is 12100-HN1-A70.
However, this product is an 89mm aftermarket big bore kit, so it should not be treated as an identical standard-bore OEM cylinder replacement.
Use the OEM reference to help identify the engine application, then confirm the 89mm big bore configuration and physical dimensions.
¿Qué modelos o situaciones no son compatibles con esta pieza?
Do not assume this kit fits:
Every Honda 400cc engine
TRX400X model years not listed
Engines using a different cylinder design or mounting pattern
Engines that have already received incompatible internal modifications
Applications requiring a standard-bore OEM-style replacement
Engines where an 89mm big bore configuration cannot be properly accommodated
This kit is specifically intended as a big bore conversion for compatible applications.
¿Qué debo verificar antes de hacer un pedido?
Confirm:
Exact Honda model
Model year
89mm cylinder bore
Big bore engine configuration
Cylinder mounting pattern
Listed mounting dimensions
Piston and wrist-pin dimensions
Gasket configuration
Original cylinder design
Existing engine modifications
If the engine has previously been modified, verify all relevant internal dimensions before ordering.