Wiseco PK1396 GP Series 2-Stroke Top End Piston Kit 54mm Bore

The Wiseco PK1396 is a GP Series 2-stroke top end kit featuring a forged 54.00mm (841M) piston engineered for the demands of sustained-RPM and endurance dirt bike riding. Engineered, forged, and machined entirely in the USA at Wiseco's facility in Mentor, OH, this kit delivers race-proven reliability and performance.

The GP Series builds on Wiseco's legendary Pro-Lite foundation with a suite of advanced durability enhancements that make it ideal for riders who push their machines hard, from weekend trail riding to competitive motocross. The piston features Electra-Coating on the crown, ring groove(s), and pin bores to resist wear, combustion heat damage, and ring micro-welding. The ArmorGlide skirt coating minimizes friction for optimized power delivery and extended service life. Additional lightening operations further enhance throttle response.

Kit Includes:

• GP Series forged 54.00mm piston (part number 841M)
• High-quality piston ring(s)
• Alloy wrist pin
• Circlips
• Top end wrist pin bearing
• Complete top end gasket kit

GP Series Key Features:

• Engineered, forged, and machined in the USA — Mentor, OH
• Electra-Coated crown, ring groove, and pin bore for resistance to wear, heat, and ring micro-welding
• ArmorGlide skirt coating reduces friction and extends service life
• Extra lightening operations for improved throttle response
• Dedicated aerospace-alloy forging for superior strength-to-weight ratio
• Optimized design for long service life and top-end power
• Race-proven by top teams in Supercross, Motocross, and GNCC

The PK1396 is a complete solution for a top-end rebuild, providing all the components needed to finish the job correctly the first time. Wiseco's forged construction delivers the condensed, aligned grain structure that produces superior mechanical properties, impact resistance, and fatigue resistance compared to cast alternatives.