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Wiseco 98-04 Honda TRX450ES Foreman 9.5:1 (4825M) Piston

SKU: WISPK1591

Powersports Piston and Ring Kits

WIS Powersports Single Pistons...

Wiseco 98-04 Honda TRX450ES Foreman 9.5:1 (4825M) Piston

SKU: WISPK1591

Powersports Piston and Ring Kits

WIS Powersports Single Pistons...

A$302.56
IN STOCK! Est Ship 3-5 Days days. In stock at 1 location (only 1 available)

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Description

Exclusive Wiseco flash sale discount at StreetFX!

Talk about timing! This is a limited offer while stocks last on various Wiseco part numbers. There's never been a better time to buy your Wiseco upgrades, so what are you waiting for?!

This item is currently on sale!

Same-day payment required to secure promotional price. Promotions may end early or be extended based on stock levels or other factors.

Wiseco 98-04 Honda TRX450ES Foreman 9.5:1 (4825M) Piston

The Wiseco team has remained at the forefront of powersports performance through every era and evolution, including the development of high-performance 4-strokes. Today, Wiseco's forged 4-stroke pistons are designed for each specific engine application and built to the tightest tolerances for the ultimate combination of performance and strength. Proven at every level of riding, Wiseco 4-stroke pistons are ready to deliver the power and reliability you're looking for.

Additional Information

Wiseco 4 Stroke Forged Series Piston Kit, 91.00 mm Bore, 9.5:1 CR

Part Type

Engine Piston Set

Product Overview

Wiseco PISTON KIT W/GASKET


Data: v2 - Desc: v4.2 - Upd: 2026-11-08 09:44:48

Data: v4.2 - Upd: 2026-11-09 19:17:36

Features

  • Dedicated forgings allow for optimized strength-to-weight ratio
  • Designed and built for each specific 4-stroke powersports engine
  • Engineered, forged, and machined in the USA in Mentor, OH
  • Improved tensile strength of forged material optimizes strength and service life
  • Includes high-quality piston rings, wrist pin(s), and circlips

Note for Pistons, Rings, Rotors, Rods and engine internals

Unless otherwise specified, some brands supply brake rotors, pistons, strut mounts, rods and rings separately. In some cases, titles may indicate plural, or 'set' - eg the term “ring set” often refers to the rings for a single piston only. If you’re unsure about what’s included with this product, please contact our team for clarification.

(keyword: piston)

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Product Details

Description:Wiseco PISTON KIT W/GASKET
Part Number:wisPK1591

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Wiseco, WISECO-PRO TRU
StreetFX SKU wisPK1591
SFX Item ID 4064630
Accounting SKU wis-PK1591
Manufacturer SKU PK1591
Manufacturer UPC 193564148872
Alternative References PK1591, WIS-PK1591

Piston and Ring Kit, Forged Aluminum, 91.000mm Bore, Honda®, Kit

Wiseco powersports piston kits include your rings, piston pin, and circlips. Wiseco has a decade of experience producing quality pistons for dirt bikes, ATVs, snowmobiles, outboard marine engines, and motorcycles. Their piston kits provide strong, lightweight pistons with optimized designs that improve engine efficiency and maximize your torque and throttle response. Plus, Wiseco powersports piston kits are produced right here in the USA. It's time to blaze your own trail with Wiseco powersports piston kits.

Product Attributes
BrandWiseco
Manufacturer's Part NumberPK1591
Part TypePowersports Piston and Ring Kits
Product LineWiseco Powersports Piston Kits
UPC00193564148872
Piston MaterialForged aluminum
Bore (mm)91.000mm
Stroke68.00mm
Wrist Pin StyleFloating
Wrist Pin Retainers IncludedYes
Top Ring MaterialSteel
Top Ring Facing MaterialGas nitrided
Second Ring MaterialCast iron
Second Ring Facing MaterialCast iron
Oil Ring MaterialNitride coated stainless steel
File FitNo
GaplessNo
Gaskets IncludedYes
QuantitySold as a kit.

Manufacturer Attributes
Piston Oversize 1.00
Piston Material 2618
Product Series 4 Stroke Forged Series
Compression Ratio Actual 9.5:1
Piston Diameter 90.92
Bore Diameter 91.00
Product Market ATV/UTV
Engine Type ICE
Skirt Coating No
Included Components Piston #4825M09100, Ring Set #9100XX, Wrist Pin #S660, CirClip #CW19, Gasket #W6371
Industry Powersports
Category Hierarchy Powersports>Pistons>4-Stroke Pistons
Product Type Top End Kits
Title Wiseco 4 Stroke Forged Series Piston Kit, 91.00 MM Bore, 9.5:1 CR
Title - Web Honda TRX450FE/TRX450FM Wiseco Top End Kit - 91.00 mm Bore
Out of Stock Message Estimated Shipped Date 3-4 Weeks
Manufacturer Designation Hon TRX450ES Foreman'98-04 9.5:1 (4825M)
Product Class Engine Piston Set
Construction/Type Wiseco 4 Stroke Forged Series Piston Kit, 91.00 mm Bore, 9.5:1 CR
Product Outline <ul><li>Engineered, forged, and machined in the USA in Mentor, OH</li><li>Designed and built for each specific 4-stroke powersports engine</li><li>Improved tensile strength of forged material optimizes strength and service life</li><li>Dedicated forgings allow for optimized strength-to-weight ratio</li><li>Includes high-quality piston rings, wrist pin(s), and circlips</li></ul>
Vehicle Brief Hon TRX450ES Foreman'98-04 9.5:1 (4825M)
Market Description The Wiseco team has remained at the forefront of powersports performance through every era and evolution, including the development of high-performance 4-strokes. Today, Wiseco's forged 4-stroke pistons are designed for each specific engine application and built to the tightest tolerances for the ultimate combination of performance and strength. Proven at every level of riding, Wiseco 4-stroke pistons are ready to deliver the power and reliability you're looking for.

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