Wiseco PK1673 Top End Piston Kit 80mm 10.5:1 Forged 4-Stroke

The Wiseco PK1673 is a complete top end piston kit designed for 4-stroke powersports engines, featuring an 80mm bore and 10.5:1 compression ratio. This kit provides everything needed for an oversize top end rebuild, making it the ideal one-kit solution for restoring engine performance.

Wiseco forged 4-stroke pistons are engineered, forged, and machined in the USA at their facility in Mentor, OH. Each piston is designed to the tightest tolerances for a specific engine application, delivering the ultimate combination of performance, strength, and reliability.

Key Features:

• 80mm bore diameter with a 10.5:1 compression ratio — +1mm oversize
• Forged from aerospace-grade alloy for improved tensile strength and extended service life
• Dedicated forgings provide an optimized strength-to-weight ratio
• Race-ready finish with smooth edges for improved combustion chamber flow
• Horizontal slot-pin oiling reduces friction and provides scuff resistance
• Pressure seal groove for maximum ring seal

Kit Includes:

• Forged piston (P/N 4576M)
• Piston rings
• Wrist pin
• Circlips
• Top end gasket set

Proven at every level of riding, Wiseco's 4-stroke piston kits are trusted by top race teams worldwide and are the go-to choice for riders seeking a reliable, high-performance top end rebuild.