Wiseco 40133M10100 4-Stroke Forged Piston Kit KLX650 101mm Oversize 9.5:1 CR

The Wiseco 40133M10100 is a complete forged piston kit engineered for the Kawasaki KLX650, featuring a 101mm oversize bore and a 9.5:1 compression ratio. Forged from high-silicon aluminum alloy, this piston delivers improved tensile strength and an optimized strength-to-weight ratio compared to cast alternatives.

Key Features:

• Forged aluminum construction — high-silicon alloy provides maximum strength and durability under high-performance conditions
• Pro-Lite forging design — engineered for maximum heat transfer and reduced reciprocating mass
• Computer-engineered piston skirt profile — stabilizes the piston in the bore, minimizing cylinder wall friction for peak horsepower and torque
• Anti-detonation grooves — ring land geometry promotes a turbulent seal between the compression ring and cylinder wall, eliminating ring blowby
• Floating wrist pin design — 24mm (0.945 in.) wrist pin diameter for reliable load distribution
• 101mm oversize bore — requires cylinder sleeving or overbore machining
• 9.5:1 compression ratio — maintains stock compression while accommodating the oversize bore
• Engineered, forged, and machined in the USA — manufactured in Mentor, OH to tight tolerances
• Complete kit — includes forged piston, high-quality piston rings, wrist pin, and circlips

Wiseco piston kits are built to the tightest tolerances for each specific engine application, delivering the ultimate combination of performance, reliability, and service life. Note: this oversize piston requires cylinder sleeving or professional overbore machining prior to installation.