Wiseco PK1256 Pro-Lite 2-Stroke Piston Kit 56.0mm Bore (676M)

The Wiseco PK1256 Pro-Lite Top End Piston Kit delivers a 56.00mm bore (676M forging) forged piston solution engineered for the demanding performance requirements of 2-stroke dirt bike competition. This kit includes everything needed for a complete top-end rebuild, pairing a precision-forged piston with a matched top-end gasket set.

Pro-Lite Series — Built for Performance and Reliability:

• 56.00mm bore diameter — 2.00mm oversize, forging code 676M
• Forged in the USA — Wiseco manufactures all pistons and forge tooling in-house for complete quality control from raw material to finished part
• Optimized grain structure — Forged construction aligns grain flow to part geometry, delivering superior mechanical strength, impact resistance, and fatigue life compared to cast pistons
• Pro-Lite forging design — Lightening operations reduce reciprocating mass for improved throttle response and high-RPM performance
• Skirt coating — Factory-applied coating reduces friction and improves break-in characteristics
• Includes top-end gasket kit — Complete gasket set included for a full top-end refresh
• Matched piston ring(s) — Pre-fit rings included and sized to the 56.00mm bore
• Wrist pin and circlips included — All necessary hardware for installation

Why Forged Over Cast?

Cast pistons lack defined grain structure and are prone to catastrophic failure when material yield strength is exceeded. Wiseco forgings feature condensed, aligned grain flow that produces higher mechanical properties and resistance to impact and fatigue — critical advantages in high-compression, high-RPM 2-stroke applications.

Wiseco's vertically integrated manufacturing process — from in-house forge tooling and dyno testing to skirt coating and distribution — ensures every Pro-Lite kit meets the tight tolerances required for competitive and recreational 2-stroke riding.