J.E. PISTONS 394140 Ultra Piston Kit Oversized 193564557117 0.07IN To

( Brand: J.e. Pistons ), ( Manufacturer Part Number: 394140 ), ( 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: 4.32in. ), ( Compression: 10.25 ), ( Legal Disclaimer: Your Local Laws Before Purchasing. ), ( Photo Disclaimer: For Reference Only, May Differ From Product, See Item Details. ), ( Sizing: 0.070in. Oversize ), ( Vehicletype: American Vtwin ), ( UPC: 193564557117 )

Review J.E. PISTONS Powersports Ultra Series Piston Kit 0.07in Oversized To

The JE Pistons 394140 Ultra piston kit is an exceptional upgrade for high-performance applications seeking enhanced power output and unparalleled durability. This piston kit is specifically designed for oversized applications with a 0.07-inch increase in piston diameter.

The Ultra piston series is renowned for its advanced design and engineering, incorporating state-of-the-art materials and manufacturing processes. Each piston features JE's patented Wrist Pin Boss design, which provides increased strength and rigidity, ensuring optimal power transfer from the crankshaft to the piston.

The pistons are crafted from JE's proprietary 2618-T6 aluminum alloy, which offers superior strength and durability compared to standard piston materials. The piston skirts are treated with JE's proprietary Diamond-Like Carbon (DLC) coating, providing an ultra-smooth surface finish that minimizes friction and ensures reliable operation even under the most demanding conditions.

Additionally, the JE 394140 Ultra piston kit includes high-performance piston rings, which are designed to maximize ring seal and minimize friction. The piston rings are made from top-quality materials, including chrome molybdenum alloy ring grooves, ensuring optimal ring grip and longevity.

The piston kit also includes JE's proprietary piston pin design, which features a precision-machined, heat-treated 4340 steel piston pin and a high-strength, low-friction piston pin retainer. This design provides increased durability and reduces friction, ensuring smooth operation and reliable performance.

The JE Pistons 394140 Ultra piston kit is an excellent choice for high-performance applications seeking enhanced power output, unparalleled durability, and reliable operation. With its advanced design, superior materials, and meticulous manufacturing processes, this piston kit is sure to exceed expectations and deliver unmatched performance.

Pros and Cons of Buying JE Pistons 394140 Ultra Piston 0.07in Oversized Kit

The JE Pistons 394140 Ultra piston is an oversized piston kit designed for high-performance applications. This kit comes with several benefits and drawbacks that are essential to consider before making a purchase. In this analysis, we will discuss the pros and cons of buying a JE Pistons 394140 Ultra piston 0.07in oversized kit.

1. Enhanced Engine Performance: The oversized pistons help to increase the engine's compression ratio, leading to improved power output and torque. This makes the engine more responsive and potent, making it an ideal choice for high-performance applications.

2. Durability: JE Pistons are known for their superior quality and durability. The Ultra piston kit is no exception. It is engineered using high-quality materials and manufacturing processes, ensuring that the pistons can withstand the rigors of high-performance driving.

3. Precision Manufacturing: The JE Pistons 394140 Ultra piston kit undergoes meticulous manufacturing processes, ensuring that each piston is perfectly balanced and fits snugly within the engine cylinder. This leads to smoother engine operation, reduced vibrations, and improved engine life.

4. Customizability: JE Pistons offers a wide range of piston designs and sizes to cater to various engine configurations. This customizability allows engine builders to choose the perfect piston kit for their specific application, ensuring optimal engine performance.

1. Cost: The JE Pistons 394140 Ultra piston kit is a premium product, and the cost reflects its high-performance capabilities. The kit may be more expensive than other aftermarket piston options, making it a less viable choice for budget-conscious engine builders.

2. Complex Installation: Installing the JE Pistons 394140 Ultra piston kit requires a high level of expertise and experience. The oversized pistons may require additional engine modifications, such as crankshaft grinding or cylinder bore honing, to ensure proper installation and engine operation.

3. Potential Engine Damage: Installing oversized pistons in an engine that is not designed for such modifications can lead to catastrophic engine damage. Improper installation, incorrect clearances, or incorrect piston-to-liner fitment can result in engine failure, seizure, or even total engine destruction.

The JE Pistons 394140 Ultra piston kit offers several advantages, including enhanced engine performance, durability, precision manufacturing, and customizability. However, it also comes with some drawbacks, such as high cost, complex installation, and potential engine damage if not installed correctly.

To determine if the JE Pistons 394140 Ultra piston kit is the right choice for your engine build, carefully consider the benefits and drawbacks discussed in this analysis. If you have the necessary expertise, experience, and budget, the JE Pistons 394140 Ultra piston kit can be an excellent investment that delivers impressive engine performance.

1. Consult with a Professional: Engage the services of a professional engine builder or mechanic to assess your engine's suitability for oversized pistons and to ensure proper installation.

2. Research and Plan: Thoroughly research the JE Pistons 394140 Ultra piston kit and its compatibility with your engine. Consider the potential modifications required and the associated costs.

3. Budget Appropriately: Determine your budget for the piston kit and factor in the costs of any necessary modifications or engine rebuilds.

4. Choose the Right Piston Kit: Select the appropriate piston kit based on your engine configuration and desired performance goals.

5. Proper Installation: Ensure that the pistons are installed correctly, using the appropriate tools and techniques, to avoid potential engine damage and ensure optimal performance.

Details:

Compression: 10.25:1 Compression, Sizing: 0.070in. Thermal Barrier Crown Coating - a ceramic coating on the piston crown greatly reduces heat transfer into material, decreasing fatigue and improving longevity. Tiff Skirt - a proprietary, Molly-based dry film skirt coating is applied in-house and reduces operating friction for better wear resistance. Bore: 4.32in.

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. Stroke length : 4.5In. Sold as a complete kit with all necessary Pistons, rings, wrist pins and wire locks under one part number. Oversize, Piston Head Shape: Dished.

Ultra-thick ring lands aid in maintaining stability forced induction and high-horsepower N/A engines, contributing to consistent seal power. 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. Double pin boilers - two oil channels feed into the bore to maintain proper lubrication improve wrist and wear resistance.

part #: 394140 prices

• $551.08-$694.99

specifications pistondon:

• brand: J.e. Pistons
• mpn: 394140
• 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: 4.32in.
• compression: 10.25
• legal disclaimer: Your Local Laws Before Purchasing.
• photo disclaimer: For Reference Only, May Differ From Product, See Item Details.
• sizing: 0.070in. Oversize
• vehicletype: American Vtwin
• upc: 193564557117

seller pistondon:

• rating: 97.9%
• city: Cedar Park, Texas
• # reviews: 178171

offer pistondon:

• options: Ship-to-home
• started: November 18, 2025
• sold: 0
• best offers: True
• availability: In Stock
• quantity: 5

returns pistondon:

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

general pistondon:

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

payments pistondon:

• other
• credit card: Diners-club
• wallet: Google-pay

shipping pistondon:

• class: Expedited, Standard
• transit: 2-6 Days
• cost: $0.00
• type: Fixed
• service: Expedited, Standard

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