Wiseco 556M06900 Pro-Lite Forged Piston Kit Bore - 2-Stroke 69.00mm

The Wiseco 556M06900 is a Pro-Lite 2-Stroke Forged Piston Kit featuring a 69.00mm bore (1.60mm oversize). Part of Wiseco's legendary Pro-Lite line, this piston kit is engineered, forged, and machined entirely in the USA at Wiseco's facility in Mentor, Ohio, ensuring strict quality control from raw material to finished product.

Wiseco's Pro-Lite forged pistons are built from high-silicon, low-expansion aluminum alloy, delivering superior strength, reduced weight, improved heat transfer, and longer service life compared to standard cast pistons. Unlike cast pistons, which are brittle and prone to catastrophic failure under stress, Wiseco forgings feature a condensed, aligned grain structure that provides exceptional resistance to impact and fatigue — exactly what demanding 2-stroke ATV applications require.

Key Features:

• Wiseco Pro-Lite forged 2-stroke piston design
• 69.00mm bore diameter — 1.60mm oversize
• Forged from high-silicon, low-expansion aluminum alloy
• Dedicated forging design optimized for strength-to-weight ratio
• Extra lightening operations for enhanced throttle response
• Diamond-turned finish via CNC machining for precision sizing
• Engineered, forged, and machined in the USA (Mentor, OH)

Kit Includes:

• Forged piston
• Piston rings
• Wrist pin
• Circlips

Wiseco's oversize pistons are ideal for restoring cast iron-lined cylinders that have been bored out, refreshing performance and extending engine life. With decades of 2-stroke piston engineering behind every part, the Pro-Lite delivers proven reliability for all-purpose ATV riding.