Wiseco PK1346 Pro-Lite Forged Piston Kit Bore - 2-Stroke 55.0mm

The Wiseco PK1346 Pro-Lite Piston Kit is a forged 2-stroke piston assembly built for the 2003–2004 Yamaha YZ125. Featuring Wiseco's legendary 797M forging at a 55.0mm overbore diameter, this kit delivers the ideal solution for top-end rebuilds or overbore applications requiring proven performance and reliability.

Key Features:

• Forged from high-silicon aerospace aluminum alloy for superior strength-to-weight ratio and long service life
• Pro-Lite series — Wiseco's trusted all-purpose 2-stroke piston design refined over decades of manufacturing expertise
• CNC machined for optimal cam shape and profile, delivering peak horsepower and extended service life
• Innovative forging design and piston skirt maximize horsepower and torque output
• Lightweight alloy wrist pin enables faster revs and quicker throttle response
• High-performance ring set included for extended life and sustained power delivery
• Engineered, forged, and machined in the USA (Mentor, OH)

Kit Includes:

• 1 Pro-Lite forged piston (55.0mm / 797M forging)
• 1 high-performance ring set
• 1 alloy wrist pin
• 2 circlips

Note: Top-end bearings, gaskets, and cylinder sleeves are not included unless otherwise specified. Pistons are sold by application and bore size — measure your cylinder before ordering to confirm the correct oversize.