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Wiseco 4606M08500 Forged Piston Kit 85mm 10:1 Honda TRX400EX TRX400X

Wiseco 4606M08500 Forged Piston Kit 85mm 10:1 Honda TRX400EX TRX400X

Regular price $189.99
Regular price Sale price $189.99
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Wiseco High-Performance Forged 4-Stroke Piston Kit — 85.00mm (Standard / Stock Bore)

Part Number: 4606M08500

Condition: Brand New in Original Packaging

Shipping: FREE Standard Shipping to the Lower 48 US States!


Product Overview

Restore or upgrade your Honda 400cc ATV engine with the unmatched durability of a Wiseco forged piston. Designed as a direct drop-in replacement for standard 85mm bore cylinders, this kit maintains a reliable 10:1 compression ratio while delivering superior fatigue strength and performance compared to stock cast pistons.


Technical Specifications

  • Manufacturer: Wiseco

  • Part Number: 4606M08500

  • Bore Diameter (Actual): 85.00mm (Standard Stock Bore)

  • Stroke: 70.00mm

  • Displacement: 397cc

  • Compression Ratio: 10:1

  • Engine Type: 4-Stroke

  • Material: Forged Aerospace-Grade Aluminum Alloy


Included Components

  • (1) Wiseco Forged Piston (4606M08500)

  • (1) High-Performance Ring Set (Part # 3346XC)

  • (1) Wrist Pin (Part # S522)

  • (2) Circlips (Part # CW20)


Vehicle Fitment

  • Honda TRX400EX FourTrax / Sportrax: 1999 – 2008

  • Honda TRX400X: 2009 – 2014

  • Honda XR400R: 1996 – 2004

Please verify cylinder bore size and condition prior to installation.


Shipping & Terms

  • FAST & FREE SHIPPING: Ships free to all physical street addresses within the lower 48 contiguous United States.

  • Handling: Orders ship within 1 business day with tracking provided.

  • Returns: 30-day return window. Item must be brand new, uninstalled, and in its original intact packaging.

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