VintCo piston kit PSY21-0.5 is a replacement piston assembly for 1991 Yamaha YZ250 and WR250 2-stroke models. Supplied in a 68.5 mm size with +0.5 mm oversize, this kit is intended for engine rebuild work and includes the piston, rings, pin and clips. It is manufactured using modern materials and production methods for OEM-style fitment and performance, with a MoS2 coating to support initial running-in.

Features

• Complete piston kit with piston, rings, pin and clips
• Suitable for vintage 2-stroke engine rebuilds
• MoS2 coating supports break-in
• Wrist pin bearing sold separately

Specifications

• VintCo Part Number: PSY21-0.5
• Piston diameter: 68.5 mm
• Oversize: +0.5 mm
• Piston size: 68.44 mm
• Clearance: 0.06 mm
• Construction: Forged piston
• Made in Germany

Vehicle Fitments

• 1991 Yamaha WR250
• 1991 Yamaha YZ250