Wiseco 521M05700 Pro-Lite Piston Kit Bore Oversize - 2-Stroke 57.00mm 1.00mm

The Wiseco 521M05700 Pro-Lite Piston Kit is a complete forged 2-stroke piston kit designed for dirt bike applications requiring a 57.00mm bore at 1.00mm oversize. Built on Wiseco's legendary Pro-Lite platform, this kit delivers a proven balance of performance, reliability, and value for both trail and track riding.

Kit Includes:

• Forged Pro-Lite piston
• Piston ring(s)
• Wrist pin
• Circlip(s)

Key Features:

• Aerospace-quality high-silicon aluminum alloy forging for maximum strength and durability
• CNC machined for precise cam shape, profile, and tight tolerances
• Optimized piston skirt and forging design for improved throttle response and peak power output
• Dedicated forging geometry engineered for an optimal strength-to-weight ratio
• Horizontal slot-pin oiling reduces friction and improves scuff resistance
• Pressure seal groove for maximum ring seal and compression retention
• Race-proven design trusted by top-level race teams across all forms of motorsport
• Engineered, forged, and machined in the USA

Important Notes:

• This is a 1.00mm oversize piston — cylinder boring or sleeving is required before installation
• Measure your cylinder bore before ordering to confirm correct sizing
• Top end bearing is not included in this kit

Wiseco has been manufacturing high-performance forged pistons for over 70 years and produces all forge tooling in-house, ensuring complete quality control from raw material to finished part. The Pro-Lite series remains the go-to choice for riders seeking a dependable, performance-oriented piston for all-purpose 2-stroke engines.