This VintCo top end piston kit is a complete rebuild set for the 1978 Yamaha YZ125, supplied in a 57.0 mm, +1.0 mm oversize configuration. The kit includes a piston, rings, pin, clips, top end bearing, and a full top-end gasket set covering the head, base, intake, and exhaust. It is intended to simplify top-end rebuild work while providing fitment referenced to OEM part numbers. Components are produced using modern materials and manufacturing methods, and other size options are also available.

Features

• Complete top end rebuild kit
• Includes piston, rings, pin and clips
• Includes top end bearing
• Includes full top-end gasket kit
• Includes head gasket
• Includes base gasket
• Includes intake gasket
• Includes exhaust gaskets
• Intended to simplify rebuild work
• Cost-effective kit format
• Kit price includes a 10% saving compared with purchasing the items individually
• Designed for OEM-referenced fitment and performance

Specifications

• VintCo Part Number: KTY03-1.0
• Product type: Top End Piston Kit
• Piston size: 57.0 mm
• Oversize: +1.0 mm
• Piston construction: Forged
• Piston coating: MoS2
• Piston manufacture: Germany
• Piston reference size: 56.94 mm
• Piston clearance: 0.06 mm

Cross-Reference OEM Part Numbers

• Referenced OEM number: 2X3-11111-00-00
• Piston: 1A1-11636-03-00
• Head gasket: 2X3-11181-00
• Base gasket: 18G-11351-02-00
• Intake gasket: 3TT-13621-00-00
• Exhaust gasket: 3PA-14613-10-00
• Exhaust gasket: 248-14623-10-00
• Wrist pin bearing: 93310-216L2-00

Vehicle Fitments

• 1978 Yamaha YZ125