Engineered to meet or exceed Honda engine sealing standards, this gasket kit restores reliable compression and sealing across TRX450 engines. The complete set provides all essential gaskets and seals required for a full engine rebuild, delivering dependable performance across TRX450ES/S/FE/FM models produced from 1998 through 2004. Manufactured as aftermarket replacement, it's designed for precise fit and durable operation in demanding off-road conditions.

Comprehensive Vehicle Fitment

 

Product Specifications

 

OEM & Aftermarket Cross-Reference Information

 

What's Included

Based on standard complete gasket kits for the TRX450 engine, this kit typically includes:

• Cylinder head gasket (replaces OEM 12251-HN0-A01)

• Cylinder base gasket (replaces OEM 12191-HM7-013)

• Valve cover gasket (replaces OEM 11191-HM7-000)

• Crankcase cover gaskets (replaces OEM 11394-HM7-003, 11396-HM7-000)

• Intake and exhaust gaskets

• Valve stem seals

• All necessary O-rings and seals for a complete engine overhaul

Note: Complete gasket kits vary by manufacturer. Pro-X Racing kits include all necessary head, base, and exhaust gaskets, as well as valve seals and O-rings, making them a complete solution for top-end rebuilds . NICHE kits are available as both gasket-only and complete cylinder-piston-gasket assemblies . For a full engine rebuild, consider kits that include all necessary components or combine top-end and bottom-end components as required.

Why Choose This Aftermarket Gasket Kit?

• Direct-Fit Compatibility: Precision-engineered for Honda TRX450ES/S (1998-2001) and TRX450FE/FM (2002-2004) Foreman models, with fitment confirmed by multiple aftermarket suppliers .

• OEM Cross-Reference: Cross-references genuine Honda part numbers including 12191-HM7-013 (base gasket), 12251-HN0-A01 (head gasket), and the complete cylinder assembly 12100-HN0-A00 for confident replacement .

• Proven Aftermarket Support: Leading aftermarket brands including Pro-X Racing, Athena, NICHE, Cometic, OUMURS, and TWOM manufacture compatible gasket kits for these models, validating extensive aftermarket support for the TRX450 platform .

• Premium Materials:

  • Pro-X Racing gaskets are manufactured from high-quality materials providing exceptional heat resistance, superior sealing properties, and long-lasting durability 

  • Athena gaskets feature advanced laser cutting technology, surface treatments to compensate for irregularities, and material stress relieving processes to improve sealing in critical areas 

  • Cometic offers precision gasket components in aluminum and fiber constructions, made in the USA to exacting specifications 

• Comprehensive Coverage Options:

  • Gasket-Only Kits (Pro-X, Athena, NICHE) focus on top-end sealing components 

  • Complete Rebuild Kits (NICHE MK1003420, OUMURS) include cylinder, piston, rings, and all related gaskets for comprehensive top-end restoration 

  • Individual Components (Cometic) are available for specific applications requiring exact material specifications 

Installation Notes:

• Ensure all mating surfaces are clean and free from old gasket material before installation.

• Follow manufacturer torque specifications and tightening sequences for cylinder head bolts and case fasteners as outlined in the Honda service manual.

• Use new gaskets only—do not reuse old gaskets once removed.

• Note that some aftermarket components (like Cometic) are manufactured to order with a production time of 2-3 weeks .

• Verify your exact model and year against the fitment table to ensure compatibility with your engine configuration.

Why Upgrade?
Worn or damaged gaskets can cause compression loss, oil leaks, and contamination—leading to poor performance and potential engine damage. Restore your Honda TRX450 Foreman engine's sealing integrity with this quality aftermarket complete gasket set, designed to keep you riding with confidence.

Order your complete gasket kit today and get back on the trail with confidence.