Piston Kit Ø53.94 – Yamaha YZ125 (2005–2026) / Fantic XX125 (2021–2026) – +3mm Conrod

The VHM piston kit APYZ12521714A1 is a high-performance racing piston specifically developed for use with a +3mm longer connecting rod and 20mm small end bearing, delivering superior power output and throttle response. This piston is 100% CNC machined from high-quality material, featuring a non-circular profile that ensures consistent performance and reduced wear throughout its lifespan.

It includes an internal coating for friction reduction and Z-clips for optimal pin retention. This piston is designed for professional motocross and high-level riders seeking maximum reliability and performance.

Compatibility Note:

• For YZ125 (2005–2021): use 105mm total conrod length (Prox 03.2221)

• For YZ125 (2022–2026): use 113mm total conrod length (VHM CRK2001)

• Clearance: 0.05mm

• Must be used exclusively with a +3mm conrod and 20mm small end bearing

Technical Specifications

• Diameter: Ø53.94 mm

• Version: Special

• Piston Crown Shape: Flat top 12°

• Bore Size: Ø54 mm

• Piston Pin: Ø15 mm

• Stroke: 2-stroke

• Coating: Yes

• Piston-Cylinder Clearance: 0.05 mm

• Piston Ring End Gap: 0.35 + 0.10 mm

• Compatible Conrod: +3 mm extended

• Small End Bearing: 20 mm