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GAEAF10
ATV City  |  SKU: 188.104
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Replacement Cylinder Kit For Honda TRX 420 Rancher 2009-2023 86.50mm Bore OEM-Equivalent Top End Kit 12100-HP7-A00

Regular price £213.33
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Replacement Cylinder Kit for Honda TRX420 Rancher 420 – 86.50mm bore, OEM-equivalent top-end rebuild kit (Part No. 12100-HP7-A00). This kit provides everything needed to restore compression and engine performance on TRX420 Rancher 420 models built from 2009 through 2023, including FE/FM/FA/TM variants. Note: not suitable for 2007-2008 models. The bore size of 86.50mm ensures precise fit and reliable power restoration across eligible years.

Comprehensive Vehicle Fitment

Based on verified OEM parts data and multiple aftermarket listings, this cylinder kit fits the following Honda Rancher 420 models from 2009 through 2023 

Manufacturer Models / Series Years / Details Source
Honda Rancher 420 TRX420FA1 4x4 Auto DCT 2009–2023
Honda Rancher 420 TRX420FA2 4x4 Auto DCT EPS 2009–2024
Honda Rancher 420 TRX420FA5 4x4 Auto DCT IRS 2009–2024
Honda Rancher 420 TRX420FA6 4x4 Auto DCT IRS EPS 2009–2024
Honda Rancher 420 TRX420FE1 4x4 ES 2009–2024
Honda Rancher 420 TRX420FM1 4x4 2009–2024
Honda Rancher 420 TRX420FM2 4x4 EPS 2009–2024
Honda Rancher 420 TRX420TE1 ES 2009–2024
Honda Rancher 420 TRX420TM1 2009–2024
Honda Rancher 420 TRX420FPA 2009–2013
Honda Rancher 420 TRX420FPE 2009–2012
Honda Rancher 420 TRX420FPM 2009–2011

 

Fitment Notes:

  • Confirmed fitment for Honda Rancher 420 FE/FM/FA/FPA/FPE/FPM/TE/TM models from 2009 through 2023 

  • Not compatible with 2007-2008 Rancher 420 models, which use different engine configurations

  • Multiple aftermarket suppliers list the same compatibility data, confirming the broad application of this kit 

  • Always verify the OEM reference for your exact model and year before installation

OEM Cross-Reference Information

OEM Part Number Component Source
12100-HP7-A00 Cylinder Assembly
12100-HP5-600 Cylinder (Superseded)
13101-HP5-600 Piston
13010-HP5-600 Piston Ring Set
13111-HP5-600 Wrist Pin
13112-MAT-000 Circlips
12191-HP5-601 Cylinder Base Gasket
12251-HP7-A01 Cylinder Head Gasket
12315-HP5-601 Head Cover Gasket
12251-HP5-601 Head Gasket (Alternate)

Product Specifications

Specification Details
OEM Reference Part Number 12100-HP7-A00
Type Cylinder Kit (Top End)
Manufacturer Aftermarket
Bore Size 86.50 mm (Standard) 
Compression Ratio 9.9:1 
Displacement 420cc
Cylinder Material High-grade aluminum with steel sleeve 
Kit Includes Cylinder, Piston, Piston Rings, Wrist Pin, Circlips, Head Gasket, Base Gasket, Head Cover Gasket 
Condition New

Why This Top-End Kit Matters

The Replacement Cylinder Kit recovers lost compression, restores power, and supports reliable engine operation after wear on the TRX420's cylinder, piston, and associated gaskets. The kit components are selected to provide a robust rebuild path, helping you extend the life of your Rancher without unnecessary downtime.

For machines within the 2009–2023 range, the 86.50mm bore and included OEM-style gaskets align with factory specifications to ensure a precise, seamless fit during installation . If your model sits near the edge of compatibility (for example 2016-era variations), verify your rocker cover gasket type prior to assembly to ensure the correct gasket sealing is achieved.


OEM part numbers are provided for cross-reference purposes only. Always verify fitment using your vehicle's specific model, year, and serial number before ordering.

Restore your Honda TRX420 Rancher engine's compression with this premium aftermarket cylinder kit—order today!

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