Wiseco 774M06640 Pro-Lite 2-Stroke Forged Piston Kit 66.40mm Standard Bore

The Wiseco 774M06640 Pro-Lite Piston Kit is a complete 2-stroke forged piston kit built at standard 66.40mm bore. Forged from high-silicon, low-expansion aerospace aluminum alloy, this piston delivers superior strength, reduced reciprocating weight, improved heat transfer, and extended service life compared to cast alternatives.

Key Features:

• Forged aerospace alloy construction — dedicated forgings provide a superior strength-to-weight ratio with condensed grain structure for resistance to impact and fatigue
• CNC-machined Pro-Lite design — computer-controlled turning centers ensure optimal cam shape and skirt profile for peak power output and long service life
• Extra lightweight piston design — reduces reciprocating mass for instant throttle response
• Computer-engineered piston skirt profile — minimizes cylinder wall friction for improved efficiency
• Anti-detonation grooves and precise ring land diameter — eliminate ring blow-by while maximizing combustion pressure and performance
• Horizontal slot-pin oiling — reduces friction and provides scuff resistance along with a pressure seal groove for maximum ring seal
• Compatible with all cylinder bore compositions — cast iron, chrome, Nikasil, and boron composite cylinders
• USA-made — forged and machined at Wiseco's state-of-the-art domestic manufacturing facility

Kit Includes:

• Forged Pro-Lite piston (66.40mm standard bore)
• Piston ring(s)
• Piston pin (wrist pin)
• Circlips

The Wiseco Pro-Lite is the forged 2-stroke piston trusted by top race teams across Supercross, Motocross, and GNCC competition. Whether you're rebuilding for trail riding or race-day performance, the 774M06640 provides everything needed to complete a proper top-end rebuild.