fits make: Harley, Davidson.

( Brand: J.e. Pistons ), ( Manufacturer Part Number: 394100 )
The J.E. Pistons 394100 Ultra 4.310 0.060 piston is a high-performance aftermarket solution for Harley-Davidson V-Twin engines. This piston is designed to deliver increased power, improved durability, and enhanced reliability for Harley-Davidson motorcycles.
The Ultra piston features a 4.310-inch bore diameter, making it suitable for replacement or upgrade applications with engines that originally came with stock pistons of similar size. With a compression height of 0.060 inches, this piston provides engineers with a greater degree of flexibility to optimize combustion chamber volume and improve engine performance.
J.E. Pistons is known for their precision machining capabilities, and this Ultra piston is no exception. Made from forged 2618-T43 aluminum alloy, the Ultra piston boasts exceptional strength and stiffness while keeping weight to a minimum. Each piston undergoes a rigorous ring-gap process and is checked for squareness, straightness, weight, and dimensional accuracy before being delivered to customers.
Additionally, this Ultra piston benefits from J.E. Pistons' proprietary CNC-ported dome architecture. The ported design enhances the combustion process by maximizing the flow of fuel and air into the combustion chamber, ultimately leading to increased power output.
For enhanced durability, J.E. Pistons also includes a ductile iron wrist pin, Wristpin boss reinforcement, and a dependable, high-quality wrist pin retainer. These components work together to provide superior engine stability and reduce the likelihood of piston failure.
Lastly, the 394100 Ultra piston comes with a 2-year warranty and is compatible with a wide range of Harley-Davidson engines. Considering the quality of materials used, detail-oriented manufacturing processes, and its performance benefits, the J.E. Pistons 394100 Ultra 4.310 0.060 piston is an excellent investment for those seeking to optimize the power and longevity of their Harley-Davidson engine.
a. Enhanced Power: These pistons are designed to provide increased power output, making your Harley-Davidson engine more potent and responsive.
b. Improved Durability: JE pistons are known for their robust construction, which ensures they can withstand the forces and stresses of regular usage.
c. Customization: The piston is available in various sizes and designs to cater to different engine configurations and power goals.
d. High Quality Standards: JE Pistons, as a reputable manufacturer, adheres to the highest quality standards.
2. Cons:a. Expensive: These aftermarket pistons may cost more than stock replacements, making them a significant investment for some Harley-Davidson owners.
b. Skills Required for Installation: Installing new pistons requires specialized skills and expertise, which can be time-consuming and may demand professional assistance.
Conclusion:The JE Pistons 394100 for Harley-Davidson is an excellent investment for those seeking to upgrade their motorcycle engine's performance and durability. Despite the higher cost and the need for specialized skills for installation, the advantages improved power, long-lasting construction, and customization options significantly outweigh these challenges.
Recommendation:For motorcycle enthusiasts looking to enhance their Harley-Davidson's performance, JE Pistons' 4.310 11.25 0.060 piston (part number 394100) is a smart choice. Investing in these high-quality pistons will set your bike apart, delivering more power and reliability. Usage of a professional mechanic during installation ensures peak performance and consistent function.
JE Ultra Series Pistons 4.310 11.25:1 0.060 #394100 Harley Davidson: Pistons are built for the most demanding racers. Aligned Grain Flow Technology In-house forging has allowed JE to develop proprietary technology that directs the grain flow of aluminum around critical areas piston, increasing strength. Lateral Gas Ports Channeling combustion gases to the back of top ring groove adds pressure behind compression keep it pushed against cylinder, providing improved and more consistent seal, critical in boosted applications. Tiff Skirt Proprietary, Molly-based dry film skirt coating is applied in-house and reduces operating friction for better wear resistance.
Thermal Barrier Crown Coating Ceramic coating on the piston crown greatly reduces heat transfer into material, decreasing fatigue and improving longevity. Made in the USA. Ultra-Thick Ring Landsat's in maintaining ring stability forced induction and high-horsepower N/A engines, contributing to consistent seal power. Double Pin Oiliest oil channels fed into the pin bore maintain proper lubrication to improve wrist and wear resistance.
Complete Kit Supplied with all necessary Pistons, rings, wrist pins, and wire locks in one box.