Wiseco PK1919 Forged Piston Kit Bore CR - 4-Stroke 77mm 14.5 1

The Wiseco PK1919 is a 4-Stroke Forged Series piston kit featuring a 77.00mm bore and a high-compression 14.5:1 compression ratio, purpose-built for demanding motocross performance. Engineered, forged, and machined in the USA at Wiseco's Mentor, OH facility, this kit is designed for each specific 4-stroke powersports engine application and held to the tightest manufacturing tolerances for an optimal combination of power and durability.

Key Features:

• Forged high-silicon aluminum alloy construction — improved tensile strength over cast pistons for superior resistance to impact and fatigue
• Dedicated forgings — optimized strength-to-weight ratio for maximum throttle response and top-end power
• ArmorGlide® skirt coating — reduces piston-to-wall friction and noise for increased horsepower and extended service life
• Race-ready dome finish — smooth edges for improved combustion chamber flow
• Built to tight tolerances — ensures quiet operation and consistent, peak performance throughout its service life
• Complete kit — includes forged piston, high-quality piston rings, wrist pin, and circlips
• Proven in top-level competition including Supercross, Motocross, and GNCC racing

This is a standard bore (77.00mm) kit. Measure your cylinder before ordering to confirm proper clearance. Oversize pistons will require cylinder sleeving or re-boring to the appropriate diameter.