Wiseco 431M07075 2-Stroke Piston Kit 70.75mm Oversize Honda CR250R

The Wiseco 431M07075 is a forged 2-stroke piston kit designed as a 0.030" (0.75mm) oversize replacement, delivering an actual bore diameter of 70.75mm over the standard 70.00mm bore. Built as part of Wiseco's renowned Pro-Lite piston line, this kit restores top-end performance to the Honda CR250R (1978–1980).

Kit Includes:

• 1 forged piston (70.75mm bore diameter)
• High-performance ring set
• Alloy wrist pin (18mm)
• 2 circlip pin locks

Key Features:

• Forged aerospace alloy construction — dedicated forgings provide a superior strength-to-weight ratio for improved durability and performance
• CNC machined cam profile — optimized skirt shape for peak horsepower output and extended service life
• High-performance ring set — alloy pin and precision rings deliver sustained power and reduced friction
• Made in the USA — engineered, forged, and machined at Wiseco's facility in Mentor, OH
• 0.030" oversize bore — ideal for worn or previously bored cylinders requiring a first overbore

Note: Top-end bearings, gaskets, and cylinder sleeves are not included unless otherwise specified. This kit covers a single cylinder only. Verify your current bore size before ordering to ensure proper fitment.