56.4mm cylinder kit designed for Yamaha and Derbi 125cc models. This kit includes a high-quality forged aluminum piston and meets or exceeds OEM quality standards. It serves as a direct replacement and ensures durability and reliable performance.

Features

• Direct OEM replacement
• Meets or exceeds OEM quality standards
• Forged aluminum piston for strength and longevity
• Chrome-plated piston rings for enhanced durability
• Easy to install; professional installation recommended if unsure

Specifications

• Bore Size: 56.4mm
• Stroke: 50.0mm
• Displacement: 124cc
• Piston Pin: 16mm x 47mm
• Piston Height: 64.4mm
• Number of Piston Rings: 2
• Upper Piston Ring Thickness: 1mm
• Second Piston Ring Thickness: 1mm
• Outlet: Oval
• Cylinder Type: 3BN00

Replacement Part Numbers

• Cylinder: 3BN-11311-00
• Piston (Standard): 2YK-11631-04-35
• Piston Pin: 137-11633-00
• Piston Ring Set (Standard): 3XC-11610-00
• Circlip: 93450-17129

Vehicle Fitments

• 1987-1992 Yamaha TZR 125
• Yamaha DT R/RE/X 125
• Yamaha TDR125 3BN
• Yamaha TZR R / RR 125
• Derbi GPR 125