Wiseco 540M05700 Forged Piston Kit Bore Oversize - 2-Stroke 57mm 1.00mm

The Wiseco 540M05700 is a 2-Stroke Forged Series Piston Kit featuring a 57.00mm bore at 1.00mm oversize, purpose-built for dirt bike and ATV applications. Engineered, forged, and machined in the USA at Wiseco's facility in Mentor, OH, this piston is designed specifically for 2-stroke powersports engines to deliver the high-performance reliability Wiseco has been known for since 1941.

Wiseco is the only aftermarket piston manufacturer in the United States that produces pistons exclusively using the forging process. Starting with high-silicon, low-expansion aerospace-grade aluminum, the forging process compresses the material's molecules to increase density and align the grain flow of the alloy, resulting in superior tensile strength, impact resistance, reduced weight, improved heat transfer, and extended service life compared to cast alternatives.

Key Features:

• 57.00mm bore diameter — 1.00mm oversize for cylinder re-bore applications
• Forged 2-stroke design — dedicated forgings with lightening operations optimize the strength-to-weight ratio
• USA manufactured — engineered, forged, and machined in Mentor, OH
• Complete kit — includes piston ring(s), wrist pin, and circlips ready for installation
• Application-specific engineering — designed and built for each specific 2-stroke powersports engine
• High-silicon aluminum alloy — provides maximum strength, durability, and thermal efficiency

Kit Contents: Piston, ring(s), wrist pin, and circlips.

Note: Only Wiseco replacement ring sets are compatible with Wiseco pistons. Circlip substitution can result in severe engine damage — always use Wiseco-specified circlips.