Wiseco 40105M09900 4-Stroke Forged Piston Kit 99mm Standard Bore 10.2:1 Compression

The Wiseco 40105M09900 is a 4-Stroke Forged Series Piston Kit featuring a 99.00mm standard bore and 10.2:1 compression ratio, engineered specifically for 567cc single-cylinder powersports engines. Engineered, forged, and machined in the USA at Wiseco's facility in Mentor, OH, this piston kit is built to the tightest tolerances for the ultimate combination of performance and strength.

Key Features:

• High-silicon aerospace aluminum alloy forging delivers superior strength, reduced weight, improved heat transfer, and extended service life
• ArmorGlide skirt coating provides reduced friction, quieter operation, and improved scuff resistance
• Dedicated forgings allow for an optimized strength-to-weight ratio — tougher and more durable than cast alternatives
• Compatible with all modern cylinder bore compositions including cast iron, chrome, Nikasil, and boron composite
• Designed and built for each specific 4-stroke powersports engine application

Specifications:

• Bore: 99.00mm (Standard)
• Stroke: 73.60mm
• Displacement: 567cc
• Compression Ratio: 10.2:1

Kit Includes: Forged piston, high-performance ring set, wrist pin, and circlips — everything needed for a complete top-end piston replacement.

Note: Oversize pistons require cylinder sleeving. Standard bore replacement fits factory cylinder dimensions.