Top End Gasket Kit – Honda TRX420 FE / TM Rancher (2007–2008)

Engineered to meet or exceed Honda's top-end sealing standards, this gasket kit provides precise seals for the cylinder head, base gasket, and head cover, ensuring reliable operation during rebuilds on Honda TRX 420 FE / TM models from 2007 to 2008. The gasket set is designed for straightforward installation in top-end service and delivers consistent compression and leak-free performance across the TRX420 family. This aftermarket replacement is engineered to perform like original equipment with durable materials and accurate dimensions for a clean, reliable seal.

Comprehensive Vehicle Fitment

 

Product Specifications

 

OEM Cross-Reference Information

*OEM cross-reference numbers are provided for reference purposes only. These part numbers are confirmed for 2007-2008 TRX420 models through official Honda parts diagrams . 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 TRX420 engine, this kit typically includes:

• Cylinder head gasket (replaces OEM 12251-HP5-601)

• Cylinder base gasket (replaces OEM 12191-HP5-601)

• Cylinder head cover gasket (valve cover) (replaces OEM 12315-HP5-601)

• Exhaust gasket(s)

• Intake gaskets

• Valve stem seals

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

Note: Complete top-end rebuild kits from leading aftermarket manufacturers may include additional components such as pistons, rings, wrist pins, and circlips . This listing is for the gasket kit only unless otherwise specified.

Why Choose This Aftermarket Top End Gasket Kit?

• Direct-Fit Compatibility: Precision-engineered for Honda TRX420FE/FM/TE/TM Rancher models specifically for the 2007–2008 model years .

• OEM Cross-Reference: Cross-references genuine Honda part numbers 12191-HP5-601, 12251-HP5-601, and 12315-HP5-601 for confident replacement .

• Proven Aftermarket Support: Leading aftermarket brands such as Namura manufacture compatible top-end gasket kits specifically for 2007-2008 TRX420 models, featuring high-quality materials and OE-spec manufacturing .

• Premium Materials: Head gasket constructed from high-grade materials for superior sealing under high heat and pressure .

• Complete Coverage: Includes all essential gaskets for cylinder head, base, and valve cover .

• 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.

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.

• Verify your specific model and year before ordering, as 2007-2008 represent the first generation of the TRX420 platform .

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 TRX420 Rancher engine's sealing integrity with this quality aftermarket top end gasket set, designed to keep you riding with confidence.

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