PROX

PROX Standard (94.96 mm) YZ426F Piston Kit

Name: PROX Standard (94.96 mm) YZ426F Piston Kit
Brand: PROX
SKU: Standard (94.96 mm)

Maximize Engine Performance with the Pro X Piston KitThe Pro X Piston Kit offers top-tier performance for your Yamaha YZ426F (2000-2002). Crafted from a specialized low-expansion, low-friction aluminum alloy, this cast piston provides durability akin to forged pistons at a more accessible price p...

$184.99*

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*Price sourced from Amazon.com. Last updated:Aug 28, 2026.Price and availability are subject to change — details.

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Overview

Maximize Engine Performance with the Pro X Piston Kit

The Pro X Piston Kit offers top-tier performance for your Yamaha YZ426F (2000-2002). Crafted from a specialized low-expansion, low-friction aluminum alloy, this cast piston provides durability akin to forged pistons at a more accessible price point. Selected models feature a tin-based skirt coating for enhanced wear resistance.

Brand: PROX
Model: Standard (94.96 mm)
Compatibility: Yamaha YZ426F (2000-2002) - See fitment guide image for additional compatible machines.
Material: High silicon content aluminum alloy
Kit Includes: Piston, piston rings, wristpin, and circlips
Coating: Some models include tin-based anti-friction skirt coating
Note: Wristpin bearing not included for 2-stroke engines

Key Features

Kit includes piston, piston rings, wristpin, and circlips

Does not include wristpin bearing for 2 strokes

High silicon content aluminum alloy piston

Some models include tin-based anti-friction skirt coating

Specifications

Piston Diameter

94.96 mm

Kit Components

Piston, Piston Rings, Wristpin, Circlips

Piston Material

High silicon content aluminum alloy

Piston Coating (some models)

Tin-based anti-friction skirt coating

Compatibility

YZ426F

Frequently Asked Questions

What components are included in the PROX Standard YZ426F Piston Kit?

The kit is comprehensive, including the piston, piston rings, wristpin, and circlips necessary for replacement.

What material is the piston made from?

The piston is constructed from a high silicon content aluminum alloy, designed for durability and performance.

Does this kit include a wristpin bearing?

No, the kit specifically states that it does not include a wristpin bearing, particularly for 2-stroke applications.

Is the piston skirt coated for reduced friction?

Some models of this piston kit include a tin-based anti-friction skirt coating, which can contribute to less wear and a longer lifespan.

What is the standard piston size for this kit?

The piston in this kit is a standard size of 94.96 mm, intended for a direct fit in the specified YZ426F model.

Is this piston kit compatible with other motorcycle models besides the YZ426F?

This PROX piston kit is specifically designated for the YZ426F, implying it is engineered for precise fit and function with that particular model.

Strengths & Trade-offs

👍 Pros

The kit includes all essential components for a piston replacement: piston, rings, wristpin, and circlips.
Piston is made from a high silicon content aluminum alloy, contributing to durability and strength.
Some models feature a tin-based anti-friction skirt coating, which can reduce wear and extend piston life.
Designed as a standard size (94.96 mm), ensuring a direct fit for specific compatible models.
Prox is a recognized brand in powersports, suggesting a level of quality and reliability for the components.
Provides a comprehensive solution for engine rebuilds or maintenance of the YZ426F.

👎 Cons

This kit is explicitly designed for the YZ426F model and its standard size, limiting compatibility with other makes or modified engines.
The "some models include" clause for the anti-friction skirt coating means it's not a guaranteed feature for every purchase.
A wristpin bearing is not included, meaning 2-stroke engine applications would require a separate purchase.
The kit does not specify whether gaskets or other ancillary components for a complete top-end rebuild are included.
Installation requires mechanical expertise and specialized tools, as it involves engine disassembly.
The high silicon content, while durable, might imply different expansion characteristics compared to other alloys.