Top End Gasket Kit for Honda TRX 420 FE/FM/TE/TM (2009–2023). This aftermarket replacement gasket kit provides reliable sealing for top-end rebuilds, supporting proper compression and engine longevity. Includes metal valve stems for added durability. Compatible with Honda TRX 420 FE/FM/TE/TM models from 2009 through 2023.
Comprehensive Vehicle Fitment
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
Based on standard top-end gasket kits for the TRX420 engine, this kit typically includes:
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Cylinder head gasket (replaces OEM 12251-HP7-A01)
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Cylinder base gasket (replaces OEM 12191-HP5-601)
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Valve cover gasket (replaces OEM 12315-HR0-F01 or 12315-HP5-601)
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Exhaust gasket (replaces OEM 18291-MN4-920)
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Metal valve stems for enhanced durability
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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 with metal valve stems unless otherwise specified.
Why Choose This Aftermarket Top End Gasket Kit?
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Direct-Fit Compatibility: Precision-engineered for Honda TRX420FE/FM/TE/TM Sportrax / Rancher models spanning 2009 through 2023 .
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OEM Cross-Reference: Cross-references genuine Honda part numbers 12251-HP7-A01, 12315-HR0-F01, 12191-HP5-601, 12315-HP5-601, 18291-MN4-920, and multiple O-rings for confident replacement .
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Proven OEM Validation: Official Honda OEM parts diagrams confirm these part numbers for 2021 TRX420TM1 models, verifying long-term consistency in the TRX420 platform .
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Premium Materials: Head gasket features 2-layer metal core construction for superior sealing under high heat and pressure .
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Metal Valve Stems: Includes durable metal valve stems for enhanced longevity and reliable valve operation.
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Complete Coverage: Includes all essential gaskets for cylinder head, base, valve cover, and exhaust, plus necessary O-rings .
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Restores Compression: New head and base gaskets ensure proper cylinder sealing for optimal engine performance.
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Prevents Leaks: Complete sealing kit prevents oil seepage and maintains clean engine operation.
Why This Kit Stands Out
Engineered for dependable top-end sealing, this gasket set provides precise tolerances and durable valve stem hardware to support long-term engine reliability. The kit is designed for straightforward installation during rebuilds, helping you maintain proper compression, oil control, and engine longevity across the TRX 420 family. Ideal for hobbyists performing routine maintenance, professional rebuilds, or shops stocking reliable aftermarket replacements for Honda TRX 420 engines.
Installation Notes:
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Ensure all mating surfaces are clean and free from old gasket material before installation.
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Follow manufacturer torque specifications and tightening sequences for cylinder head bolts.
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Use new gaskets only—do not reuse old gaskets once removed.
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Check valve clearance after head installation and adjust if necessary.
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After installation, run the engine and check for any signs of leaks.
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Verify your specific model and year before ordering, as the TRX420 was produced in multiple 2x4 and 4x4 configurations .
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 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.
