JE Pistons Piston Kit, 77.00 mm, 14.0:1 Compression Ratio for Yamaha (323557)

The JE Pistons 323557 Piston Kit is engineered for Yamaha performance applications requiring reliable strength, precise fitment, and a high 14.0:1 compression ratio. Built with internal and external bracing, this forged piston assembly is designed to withstand demanding engine conditions while supporting consistent performance. Dedicated embossed forgings help reduce weight without compromising structural integrity, making this kit a practical choice for performance-focused engine builds.
Specialized manufacturing processes further enhance the piston’s design. Internal milling of the internal struts reduces unnecessary mass, while the dedicated accumulator groove and forged side relief support durability and efficient operation. The dome top features smooth radii, eliminating the need for deburring or additional preparation before installation when used with the appropriate application and supporting components.
The JE Pistons 323557 kit includes piston(s), wrist pin, circlip, and rings unless otherwise noted. Each component is selected to work together as a complete piston assembly, helping simplify installation and reduce the need to source individual parts separately. The 77.00 mm piston size and 14.0:1 compression ratio should be verified against the engine configuration, cylinder specifications, clearances, and intended use before installation.
Made in the USA, the JE Pistons 323557 Piston Kit delivers performance-oriented design and dependable forged construction for Yamaha applications. Follow the manufacturer’s installation procedures and verify all required clearances, ring gaps, and compatibility details during engine assembly.

Features:

• Brand: JE Pistons

• Part Number: 323557

• Application: Yamaha performance engines

• Piston Size: 77.00 mm

• Compression Ratio: 14.0:1

• Construction: Forged piston with internal and external bracing

• Weight Reduction: Dedicated embossed forgings and internally milled struts

• Design: Dedicated accumulator groove and forged side relief

• Dome Top: Smooth radii requiring no deburring or preparation

• Kit Contents: Piston(s), wrist pin, circlip, and rings unless otherwise noted

• Origin: Made in the USA

Ships from Parts Unlimited.