Wiseco 4959M08900 4-Stroke Pro-Lite Forged Piston Kit 89mm Standard Bore 13.5:1

The Wiseco 4959M08900 is a 4-Stroke Pro-Lite forged piston kit featuring a standard 89.00mm bore and a high-compression 13.5:1 compression ratio. Engineered, forged, and machined in the USA at Wiseco's facility in Mentor, OH, this piston kit is built to deliver the ultimate combination of strength, performance, and reliability for demanding off-road and ATV applications.

Wiseco's forged 4-stroke pistons are designed for each specific engine application and manufactured to the tightest tolerances, ensuring consistent power output and long service life. The forging process produces a denser, stronger piston compared to cast alternatives — optimizing the strength-to-weight ratio while resisting the extreme heat and stress of high-performance engines.

Kit Includes:

• Forged Pro-Lite piston
• High-quality piston rings
• Wrist pin
• Circlips

Key Features:

• Standard 89.00mm bore for a direct OEM replacement fit
• 13.5:1 high-compression ratio for enhanced power output
• Forged aerospace-grade alloy construction for superior tensile strength and durability
• Dedicated forgings allow for an optimized strength-to-weight ratio
• Designed and built in the USA — engineered for each specific 4-stroke powersports engine
• Compatible with Wiseco replacement ring sets only

With over 80 years of experience, Wiseco has perfected the art of piston manufacturing and is the only U.S. manufacturer of forged pistons for the powersports market. This Pro-Lite kit provides everything needed for a complete top-end rebuild, the right way, the first time.