Engineered to meet or exceed Honda's engine sealing standards, this aftermarket replacement kit is designed to restore proper compression and sealing on the TRX500FE and TRX500FM engines from 2005 through 2011. Built to support reliable performance after top-end work, the kit provides a dependable seal across endurance riding, trail use, and routine maintenance intervals.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

*OEM cross-reference numbers are provided for reference purposes only. These part numbers are confirmed for 2005-2011 TRX500FE/FM models through multiple aftermarket and OEM sources . Always verify fitment using your machine's exact model, year, and original part number before ordering.*

What's Included

Based on standard top-end gasket kits for the TRX500 engine, this kit typically includes:

• Cylinder head gasket (replaces OEM 12251-HR0-F01)

• Cylinder base gasket

• Valve cover gasket

• Exhaust gasket(s)

• Intake gaskets

• Valve stem seals

• Related O-rings and seals as required for complete top-end sealing

Note: Complete gasket kits from Vertex are available in configurations with or without oil seals and formed rubber valve cover gaskets . Athena kits include all gaskets and oil seals for a complete engine overhaul . This listing is for a top-end gasket kit unless otherwise specified.

Why Choose This Aftermarket Top End Gasket Kit?

• Direct-Fit Compatibility: Precision-engineered for Honda TRX500FE/FM Foreman 4x4 models spanning 2005 through 2011, with additional compatibility for FPE, FPM, and TM variants .

• OEM Cross-Reference: Cross-references genuine Honda part numbers 12251-HR0-F01 and 11394-HP0-A00 for confident replacement .

• Proven Aftermarket Support: Multiple respected aftermarket brands manufacture compatible gasket kits:

  • Vertex offers comprehensive gasket kits specifically for 2005-2011 TRX500FE/FM models, providing all OEM-specified gaskets, o-rings, and seals needed for engine rebuilding

  • Athena provides complete gasket kits with over 40 years of experience, featuring Italian engineering and manufacturing that follows strict OEM parameters

  • Nippon Machines and Namura supply quality replacement components for the TRX500 platform

• Restores Compression: New head and base gaskets ensure proper cylinder sealing for optimal engine performance.

• Prevents Leaks: Complete sealing kit prevents oil seepage and maintains clean engine operation.

Why This Kit Matters

A complete top-end gasket set helps ensure proper sealing between the cylinder head, base, and related components, reducing the risk of compression loss and oil/coolant leaks after engine work. The aftermarket replacement quality provides a reliable option that aligns with OEM specifications for TRX500FE and TRX500FM models from 2005 to 2011.

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.

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

• Check valve clearance after head installation and adjust if necessary.

• After installation, run the engine and check for any signs of leaks.

• Note that some complete gasket kits may require purchasing the formed rubber valve cover gasket separately .

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 TRX500 Foreman engine's sealing integrity with this quality aftermarket top end gasket set, designed to keep you working and riding with confidence.

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