JE PISTONS 398732 Piston Kit 0910-6995 4.020 4.500 11.5

( Brand: Je Pistons ), ( Manufacturer Part Number: 398732 ), ( Part Type: Piston )

Review JE PISTONS Piston Kit 4.020 Inch Bore 4.500 Stroke 11.5 fits 500 CR

The JE Pistons 398732 0910-6995 piston kit is a high-performance solution designed for engines with a displacement of 4.020 cubic inches (65.9 cubic centimeters) and a stroke length of 4.500 inches (114.3 millimeters). This kit is suitable for applications where increased power output and reliability are required.

The pistons in this kit are forged from 2618-T6 aluminum alloy, which provides superior strength and durability compared to cast pistons. Each piston is machined to tight tolerances and features a unique, flat-top design with a dome shape that enhances combustion efficiency and reduces detonation. The piston skirts are designed to minimize friction and ensure a smooth engine operation.

The piston rings included in this kit are made of high-quality materials and feature a multi-layer design to prevent oil leakage and ensure proper sealing. The top ring is a compression ring, while the second ring is an oil control ring. The piston pin is made of 4340 chromoly steel and is hardened and precision ground for maximum strength and durability.

The piston kit also includes wrist pins, piston pin bushings, and piston pin locks. The wrist pins are made of 4340 chromoly steel and are precision machined to fit snugly in the piston pin bores. The piston pin bushings are made of high-strength bronze and are designed to provide a secure and reliable connection between the piston and the connecting rod. The piston pin locks are made of steel and are used to secure the piston pin in place.

Overall, the JE Pistons 398732 0910-6995 piston kit is a top-quality solution for high-performance applications. Its forged pistons, high-quality rings, and precision machined components ensure reliable operation and maximum power output. Whether you're building a race engine or looking to upgrade your daily driver, this piston kit is an excellent choice for your engine build.

Buying Je Pistons 398732 0910-6995 Piston Kit: A Detailed Analysis

The Je Pistons 398732 0910-6995 piston kit is a popular choice among Jeep Wrangler JK and TJ owners due to its high-performance capabilities. This piston kit, which is designed for engines with a displacement of 4.020 inches and a stroke of 4.500 inches, comes with a compression ratio of 11.5:1. In this analysis, we will discuss the potential advantages and disadvantages of purchasing this piston kit.

1. Increased Power: The primary reason for installing high-performance pistons like the Je Pistons 398732 0910-6995 kit is to increase engine power. The higher compression ratio helps the engine burn fuel more efficiently, leading to improved throttle response and overall power output.

2. Durability: These pistons are made from forged material, making them stronger and more durable than stock pistons. Forged pistons can handle higher compression and temperatures, which is essential for high-performance applications.

3. Enhanced Engine Response: The increased compression ratio results in better engine response, allowing for smoother power delivery and improved throttle response.

4. Improved Fuel Economy: Although not a significant improvement, the pistons' enhanced combustion efficiency can result in slightly better fuel economy.

1. Cost: High-performance piston kits like the Je Pistons 398732 0910-6995 are more expensive than stock pistons. The cost of this kit can be a significant investment for some Jeep owners.

2. Installation Complexity: Installing high-performance pistons can be a challenging process, as it requires the engine to be completely disassembled. This process can be time-consuming and may require professional assistance.

3. Risk of Engine Damage: Installing high-performance pistons can increase the risk of engine damage if not installed correctly. Improper installation can lead to issues such as detonation, engine knocking, or even catastrophic engine failure.

The Je Pistons 398732 0910-6995 piston kit offers several benefits for Jeep Wrangler JK and TJ owners, including increased power, durability, enhanced engine response, and improved fuel economy. However, the high cost, installation complexity, and potential risk of engine damage are important factors to consider before making a purchase.

If you are a Jeep Wrangler JK or TJ owner looking to boost your engine's performance, the Je Pistons 398732 0910-6995 piston kit is an excellent choice. However, it is crucial to ensure that the installation is carried out by a professional mechanic to minimize the risk of engine damage. Additionally, make sure to perform regular maintenance to ensure the longevity of the new pistons.

Details:

Specs: Bore Size 4.020, Compression Ratio 11.5:1, Displacement 108, Piston Material Forged 2618 Aluminum, Stroke length 4.5 Units Kit, Product Name Riding Street. Offset pins reduce piston rock and minimize operating noise. Accumulator groove taps combustion gases below the top ring to promote more consistent, positive seal and performance. Includes two Pistons, premium ring packs, wrist pins and wire locks.

This fitment information is based upon the stock version of motorcycle or unit referenced and any accessory added other modification could invalidate quick reference provided. Skirt coating reduces operating friction and wear. Skirt notches for optimal clearance at bottom dead center.

part #: 398732 prices

• $376.30-$474.99

specifications pistondon:

• for models: 500, Cr
• brand: Je Pistons
• mpn: 398732
• part type: Piston

general pistondon:

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

offer pistondon:

• availability: In Stock
• sold: 0
• quantity: 9
• started: January 21, 2026
• options: Ship-to-home

payments pistondon:

• other
• credit card: Mastercard
• wallet: Paypal

returns pistondon:

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

seller pistondon:

• # reviews: 3562
• rating: 100.0%
• city: Omaha, NE

shipping pistondon:

• cost: $0.00
• type: Fixed
• class: Standard, Expedited
• service: FedEx Ground / FedEx Home Delivery, USPS First Class, USPS Priority Mail, UPS Ground
• carrier: FedEx, USPS, UPS
• transit: 2-5 Days

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