J.E. PISTONS 394139 Ultra Piston Kit Oversized 193564557100 0.06IN To

( Brand: J.e. Pistons ), ( Manufacturer Part Number: 394139 ), ( Type: Engine ), ( California Prop 65 Warning: Cancer And Reproductive Harm Www.p65warnings.ca.gov ), ( Country Of Origin: United States ), ( Manufacturer Warranty: 1 Year Manufacturer Warranty ), ( Authorized Dealer: Yes ), ( Bore: 4.31in. ), ( Compression: 10.25 ), ( Legal Disclaimer: Your Local Laws Before Purchasing. ), ( Photo Disclaimer: For Reference Only, May Differ From Product, See Item Details. ), ( Sizing: 0.060in. Oversize ), ( Vehicletype: American Vtwin ), ( UPC: 193564557100 )

Review J.E. PISTONS Powersports Ultra Series Piston Kit 0.06in Oversized To

The JE Pistons 394139 Ultra piston kit is an excellent choice for high-performance engine builders seeking superior power output and durability. This piston kit is specifically designed to be 0.060-inch oversized, making it suitable for engines with increased bore sizes.

Each piston in this kit is meticulously crafted using JE's proprietary forged 2618-T6 aluminum alloy. This material offers exceptional strength, rigidity, and temperature resistance, ensuring the pistons can withstand the extreme pressures and heat generated in high-performance engines.

The Ultra pistons feature JE's unique Wristpin Design, which utilizes a split-pin design that allows for increased pin bore diameter without requiring an oversized crankshaft. This design provides enhanced piston-to-crankshaft interface, leading to increased power and improved engine efficiency.

The piston crowns are carefully engineered to provide optimal combustion efficiency and superior ring sealing. The piston skirts are designed with a full-dome shape, which significantly reduces frictional losses and enhances power output. Additionally, the piston skirts are available in various coatings, including Diamondlike Carbon (DLC) and Teflon , to further reduce friction and ensure a long-lasting, smooth-running engine.

The JE Pistons 394139 Ultra piston kit also includes piston pin retainers and piston rings. The pin retainers are made of high-strength steel and feature a unique design that offers improved clamping force and enhanced durability. The piston rings are precision-manufactured to ensure perfect sealing and optimal ring gap for your specific engine application.

In summary, the JE Pistons 394139 Ultra piston kit is a top-tier solution for engine builders looking to unlock the full potential of their high-performance engines. With its advanced design features, superior materials, and meticulous manufacturing processes, this piston kit delivers unrivaled power, durability, and efficiency.

Pros and Cons of Buying JE Pistons 394139 Ultra Piston Kit (0.06in Oversized)

The JE Pistons 394139 Ultra piston kit is an oversized piston solution for high-performance engine builds. This article aims to provide an unbiased analysis of the potential advantages and disadvantages of investing in this piston kit.

1. Enhanced Performance: Oversized pistons offer increased combustion chamber volume, which can lead to increased power output and improved engine efficiency.

2. Durability: JE Pistons are known for their high-quality materials and manufacturing processes, ensuring long-lasting performance and reliability.

3. Customizable: The 394139 Ultra piston kit is available in various sizes, allowing users to tailor the pistons to their specific engine requirements.

4. Forged Construction: Forged pistons are stronger and more durable than cast pistons, making them an ideal choice for high-performance applications.

1. Cost: Oversized pistons like the JE Pistons 394139 Ultra kit can be more expensive than standard pistons, making them a less viable option for those on a tight budget.

2. Complex Installation: Installing oversized pistons requires precise machining and engine rebuilding skills, which may result in additional labor costs.

3. Potential Clearance Issues: Oversized pistons may require modifications to various engine components (e.g., crankshaft, connecting rods) to ensure proper clearance and avoid damaging the engine.

The JE Pistons 394139 Ultra piston kit offers several advantages, such as enhanced performance, durability, and customizability, making it an attractive option for high-performance engine builds. However, it also comes with some disadvantages, including higher costs, complex installation, and potential clearance issues.

Based on the information provided, it is recommended that potential buyers carefully consider their engine build goals, available budget, and installation capabilities before deciding to invest in the JE Pistons 394139 Ultra piston kit. For those who can afford the investment and have the necessary skills and resources, the potential performance gains may outweigh the costs and challenges. For others, more budget-friendly and less complex piston solutions may be more suitable.

Details:

Lateral gas ports channel combustion gases to the back of top ring groove, which adds pressure behind compression keep it pushed against cylinder, providing improved and more consistent seal, critical in boosted applications. Tiff Skirt - a proprietary, Molly-based dry film skirt coating is applied in-house and reduces operating friction for better wear resistance. Double pin boilers - two oil channels feed into the bore to maintain proper lubrication improve wrist and wear resistance. Compression: 10.25:1 Compression, Sizing: 0.060in.

Sold as a complete kit with all necessary Pistons, rings, wrist pins and wire locks under one part number. Stroke length : 4.5In. Ultra-thick ring lands aid in maintaining stability forced induction and high-horsepower N/A engines, contributing to consistent seal power. Thermal Barrier Crown Coating - a ceramic coating on the piston crown greatly reduces heat transfer into material, decreasing fatigue and improving longevity.

In-house forging has allowed JE to develop proprietary Aligned Grain Flow Technology that directs the grain flow of aluminum around critical areas piston, increasing strength. Oversize, Piston Head Shape: Dished. Bore: 4.31in.

part #: 394139 prices

• $171.99-$694.99

specifications pistondon:

• brand: J.e. Pistons
• mpn: 394139
• type: Engine
• california prop 65 warning: Cancer And Reproductive Harm Www.p65warnings.ca.gov
• country of origin: United States
• manufacturer warranty: 1 Year Manufacturer Warranty
• authorized dealer: Yes
• bore: 4.31in.
• compression: 10.25
• legal disclaimer: Your Local Laws Before Purchasing.
• photo disclaimer: For Reference Only, May Differ From Product, See Item Details.
• sizing: 0.060in. Oversize
• vehicletype: American Vtwin
• upc: 193564557100

returns pistondon:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

offer pistondon:

• options: Ship-to-home
• quantity: 4
• started: November 19, 2025
• sold: 0
• best offers: True
• availability: In Stock

seller pistondon:

• rating: 97.9%
• # reviews: 178175
• city: Cedar Park, Texas

general pistondon:

• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits
• condition: New

shipping pistondon:

• class: Expedited, Standard
• cost: $0.00
• transit: 2-5 Days
• service: Expedited, Standard
• type: Fixed

payments pistondon:

• other
• credit card: Visa
• wallet: Apple-pay

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