This top end piston kit is designed for the 1977–1978 Yamaha YZ400 and provides the components required for a standard bore 85.0 mm top-end rebuild. The kit includes a VintCo piston kit with piston, rings, pin and clips, a top end bearing, and a full top-end gasket set comprising the head gasket, base gaskets, intake gasket and exhaust gaskets. The components are produced using modern materials and manufacturing methods and are intended to provide OEM-level or better fitment and performance.

Features

• Complete top-end rebuild kit
• Includes piston, rings, pin and clips
• Includes top end bearing
• Includes head gasket
• Includes base gaskets
• Includes intake gasket
• Includes exhaust gaskets
• OEM part numbers supplied for exact fitment reference
• Kit price includes a 10% saving compared with purchasing the parts individually
• Additional size options are available

Specifications

• VintCo Part Number: KTY15-00
• Product type: Top End Piston Kit
• Standard bore size: 85.0 mm
• Piston diameter: 84.92 mm
• Piston clearance: 0.08 mm
• Piston construction: Forged
• Piston coating: MoS2
• Piston manufacture: Germany

Cross-Reference OEM Part Numbers

• Piston: 2K8-11631-00-96
• Head gasket: 500-11181-00-00
• Base gasket: 500-11351-09-00
• Base gasket: 1M2-11351-01-00
• Intake gasket: 8Y7-13556-01-00
• Exhaust gasket: 214-14613-09-00
• Exhaust gasket: 248-14623-10-00
• Wrist pin bearing: 93310-218A6-00

Vehicle Fitments

• 1977 Yamaha YZ400
• 1978 Yamaha YZ400