Wiseco 723M06640 Pro-Lite 2-Stroke Dirt Bike Piston Kit Standard Bore 66.40mm

The Wiseco 723M06640 is a Pro-Lite forged piston kit designed for 2-stroke off-road dirt bike engines, featuring a standard bore diameter of 66.40mm for a 249cc single-cylinder application with a 72.00mm stroke. Engineered for both competitive racing and aggressive trail riding, this piston kit delivers the precision and durability Wiseco is known for.

Key Features:

• Forged high-silicon, low-expansion aluminum alloy construction provides superior strength, reduced weight, improved heat transfer, and longer service life
• Diamond-turned CNC finish from computer-controlled turning centers guarantees a perfect fit with zero size variation
• Optimized piston shape and profile with an innovative skirt design for maximum horsepower and torque output
• Pro-Lite design reduces reciprocating mass for improved throttle response and power delivery
• Compatible with Nikasil bore cylinders; flat top conversion design
• Double-ring configuration for reliable sealing across all RPM ranges
• Backed by over 70 years of race-proven forging experience

Kit Includes:

• Forged piston (66.40mm standard bore)
• Ring set — 2614CD 66.40mm rings
• Piston pin
• Circlips — CW18 round wire pin locks 18mm (pair)

Specifications:

• Bore: 66.40mm (Standard)
• Stroke: 72.00mm
• Displacement: 249cc
• Cylinders: 1
• Piston Type: Pro-Lite, Flat Top, Double Ring
• Bore Compatibility: Nikasil

Note: Cylinder sleeving or replating may be required for oversize applications. This kit is designed for standard bore only.