Wiseco Pro-Lite Piston Kit with Gaskets - Yamaha YZ250 (1999-2001) - 66.40mm Bore - 2-Stroke

Wiseco Pro-Lite Piston Kit with Gaskets - Yamaha YZ250 (1999-2001)

Premium Wiseco Pro-Lite 2-stroke piston kit with complete top-end gasket set for the 1999-2001 Yamaha YZ250. The lightweight Pro-Lite design is specifically engineered for high-revving 2-stroke performance. Everything you need for a professional top-end rebuild in one convenient package.

⚠️ Important: Ceramic Composite Cylinder

This piston kit fits ceramic composite bore cylinders only. Verify your cylinder type before ordering.

Kit Includes

• Wiseco Pro-Lite Piston - Lightweight 4032 aluminum alloy
• Ring Set - Wiseco performance rings
• Wrist Pin
• Circlips
• Wrist Pin Bearing
• Top End Gasket Set

Key Features

• Pro-Lite design for lightweight, high-revving 2-stroke performance
• 4032 aluminum alloy construction - optimized for 2-stroke applications
• Complete top-end gasket kit included
• Wrist pin bearing included - everything for a complete rebuild
• Standard bore - direct OEM replacement

Important Notes

• Fits ceramic composite bore cylinder only
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC)
• Wiseco pistons can be fitted only with Wiseco rings
• Cylinder sleeves must be purchased separately if needed

Piston Specifications

• Bore Size: 66.40 mm (Standard)
• Piston Diameter: 66.36 mm
• Stroke Length: 72.00 mm
• Material: 4032 Aluminum Alloy
• Skirt Coating: Non-Coated
• Style: Pro-Lite

Engine Specifications

• Displacement: 249cc
• Engine Type: 2-Stroke
• Weight: 1.4 lbs

Fitment

• Yamaha YZ250: 1999-2001

Year-Specific Fitment

This kit fits the 1999-2001 YZ250. For 2002-2025 models, see our GP Series YZ250 kit (SKU 0903-0929) which includes advanced Electra coating and single ring design.

Why Wiseco Pro-Lite?

Wiseco Pro-Lite pistons are specifically designed for 2-stroke engines. The 4032 aluminum alloy provides excellent strength-to-weight ratio, allowing for higher RPM and quicker throttle response. The YZ250 is one of the most iconic 2-strokes ever made!