Wiseco Pro-Lite Piston Kit with Gaskets (54.00mm) PK1344 - Yamaha YZ125 2003-2004

Product Description

The Wiseco PK1344 High Performance Piston Kit delivers a complete top-end solution for refreshing the 2-stroke engine on your Yamaha YZ125. Engineered for 54.00 mm standard bore applications, this kit combines Wiseco's forged Pro-Lite piston design with top-end gaskets, a wrist pin, circlips, and a top-end bearing to restore compression and throttle response in a single service.

Forged from high-tensile 4032 aluminum alloy, the Pro-Lite piston design offers reduced weight while maintaining structural strength under demanding racing conditions. Engineered specifically for standard stroke (54.50 mm) and displacement (125 cc) parameters, this kit gives your dirt bike OEM-level fitment and reliable performance across the rev range.

Top Features: Wiseco Piston Kit

• Complete top-end kit includes Pro-Lite piston, ring set, wrist pin, circlips, top-end bearing, and a complete top-end gasket set for one complete engine service.
• Forged from 4032 aluminum alloy for high strength-to-weight performance in demanding 2-stroke conditions.
• Standard 54.00 mm bore size (53.95 mm piston diameter) tailored specifically for 125 cc displacement setups.
• Designed for seamless compatibility with standard 54.50 mm stroke lengths.

Please review the detailed compatibility data below to ensure an exact fitment match for your dirt bike before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Can I use stock/OEM piston rings with this Wiseco piston?
A: No. Wiseco pistons must be fitted only with Wiseco rings to ensure proper fitment, ring gap, and cylinder wall sealing.

Q: What is included in this top-end piston kit?
A: The PK1344 kit includes a forged Pro-Lite piston, ring set, wrist pin, circlips, top-end needle bearing, and top-end gasket kit.

Expert Pro-Tip: Always measure your cylinder bore for taper and out-of-roundness before installing a standard 54.00 mm piston. Lightly hone the cylinder wall to cross-hatch the finish for proper ring seating, and make sure to gap the Wiseco rings according to the included instructions prior to installation.

Recommended Pairings:

• Yamaha YZ125 Performance Parts & Upgrades
• Piston & Top-End Kits Collection
• Yamaha 2-Stroke Performance Parts

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