Top End Gasket Kit – Honda TRX420 FA Rancher 4x4 Auto (2009–2023)

Engineered as a precise aftermarket replacement, this top gasket kit delivers reliable sealing for the top end of your Honda TRX 420 FA, helping to prevent oil leaks, maintain engine compression, and support overall performance during routine maintenance or repairs. Its form-fitting design ensures compatibility with the engine's critical components, making it an essential upgrade for riders tackling off-road trails, farm work, or daily adventures.

Comprehensive Vehicle Fitment

Compatibility spans multiple TRX420FA variants including FA2, FA5, FA6, and related 4x4 Auto configurations from 2009 through 2023 .

Product Specifications

 

OEM Cross-Reference Information

OEM cross-reference numbers are provided for reference purposes only. These part numbers are commonly referenced for Honda top-end gasket sets and may appear across multiple aftermarket suppliers . Always verify fitment using your machine's exact model, year, and original part number before ordering.

What's Included

This Top End Gasket Kit includes:

• Cylinder head gasket (replaces OEM 12251-HP7-A01)

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

• Valve cover gasket (replaces OEM 12315-HP5-601)

• Exhaust gasket (replaces OEM 18291-MN4-920)

Note: This is a top-end gasket kit only. For complete engine rebuilding, additional components such as pistons, rings, and seals may be required and are available separately from aftermarket suppliers .

Why Choose This Aftermarket Top End Gasket Kit?

• Direct-Fit Compatibility: Precision-engineered for Honda TRX420FA Rancher 4x4 Auto models spanning 2009 through 2023 .

• OEM Cross-Reference: Cross-references genuine Honda part numbers 12251-HP7-A01, 12315-HP5-601, 12191-HP5-601, and 18291-MN4-920 for confident replacement .

• Proven Aftermarket Support: Leading aftermarket brands such as Caltric offer top-end gasket sets specifically for TRX420 models, featuring 2-layer metal core head gasket material for superior durability .

• Premium Materials: Head gasket constructed from 2-layer metal core material for optimal sealing under high heat and pressure .

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

• 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.

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 FA Rancher 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.