This VintCo piston kit is designed for 1974-1975 Yamaha YZ250 models and provides a replacement piston assembly for vintage 2-stroke engine rebuilds. It is manufactured using modern materials and production methods for OEM-style fit and performance, and includes the piston, rings, pin and clips for straightforward installation. This kit is intended for use with Nikasil-plated or iron-lined cylinders only; the supplied rings are not compatible with the original chrome-plated Yamaha cylinder used on 1974-1975 YZ250 models. A wrist pin bearing is available separately, and additional size options are also available.

Features

• Complete piston kit including piston, rings, pin and clips
• Suitable for vintage 2-stroke Yamaha YZ250 engine rebuilds
• OEM-style fit and performance
• Wrist pin bearing sold separately
• Additional size options available
• Rings are compatible with Nikasil-plated or iron-lined cylinders
• Rings are not compatible with the original chrome-plated Yamaha cylinder

Specifications

• VintCo Part Number: PSY34-00
• Piston size: 70.0 mm standard
• Piston measurement: 69.94 mm
• Clearance: 0.06 mm
• Forged piston
• MoS2 coated for break-in
• Made in Germany

Vehicle Fitments

• 1974 Yamaha YZ250
• 1975 Yamaha YZ250