Wiseco 2390M06650 Pro-Lite 2-Stroke Snowmobile Piston Kit 66.50mm STD Bore

The Wiseco 2390M06650 is a Pro-Lite forged 2-stroke piston kit with a standard 66.50mm bore, engineered for snowmobile engines displacing 438cc with a 63.00mm stroke. Designed for Nikasil-lined cylinders, this kit delivers a reliable performance refresh whether you're rebuilding for the trail or the track.

Pro-Lite Piston Features:

• Dedicated forging design for an optimized strength-to-weight ratio using aerospace-grade aluminum alloy
• Forged from high-silicon, low-expansion aluminum for superior strength, reduced weight, improved heat transfer, and extended service life
• CNC diamond-turned finish for precise sizing with no variation and optimal cam profile for peak performance
• Computer-engineered piston skirt profile minimizes cylinder wall friction and maximizes throttle response
• Extra lightening operations for enhanced throttle response
• Engineered, forged, and machined in the USA in Mentor, OH

Specifications:

• Bore Size: 66.50mm (Standard)
• Displacement: 438cc
• Stroke: 63.00mm
• Cylinders Covered: 2
• Wrist Pin: 18mm x 2.244" unchromed (Part# S511) — qty 2
• Note: Designed for Pro-Lite / Nikasil bore applications

Kit Contents (per cylinder):

• 1x Forged piston
• 1x Ring set — 2618CD 66.50mm CD-series ring set
• 1x Wrist pin — S511 18mm x 2.244" unchromed (qty 2 total for 2 cylinders)
• 2x Round wire pin locks — CW18 18mm (pair)

Important Notes:

• This kit covers a single cylinder only; order one kit per cylinder
• Wiseco rings are not interchangeable between ring series (e.g., CD rings fit only CD-series pistons)
• Top-end bearings, gaskets, and sleeves are not included unless otherwise noted
• Piston and rings are sold by bore size — confirm your standard or oversize bore before ordering