Wiseco Piston Standard Yamaha YZ125 1994-1996 647M05400

If you're running a 1994-1996 Yamaha YZ125, piston wear directly impacts throttle response, compression, and overall engine reliability. A worn or damaged piston forces you to compensate with tuning adjustments and risks catastrophic engine failure mid-race or trail. The Wiseco 647M05400 restores factory performance specifications with measurable gains in acceleration and durability.

This piston kit is engineered for the demands of competitive riding and serious recreational use. High-silicon aluminum construction resists thermal stress and scuffing, while the precision 54.00 mm bore diameter maintains tight tolerances for consistent power delivery. Installation is straightforward—the kit includes everything needed for a complete top-end rebuild.

• Bore Diameter: 54.00 mm
• Material: High-silicon aluminum alloy
• Fitment: Yamaha YZ125 (1994–1996)
• Kit Contents: Piston, rings, wrist pin, circlips
• Installation Type: Bolt-on replacement
• Machining Process: CNC-precision engineered
• Heat Resistance: Optimized for 2-stroke demands