Wiseco PK1157 Top End Kit 40.00mm Forged Piston Yamaha PW50 1985-2025

When it’s time to rebuild your PW50, go with the best in the business—Wiseco PK1157 Forged Series Top End Kit Yamaha PW50. Wiseco is the name trusted by pro racers and backyard tuners alike, delivering the performance and durability your little ripper deserves.

This PK1157 Top End Kit includes a 40.00mm forged piston specifically engineered for the legendary Yamaha PW50 (1985–2025). Built in the USA with dedicated forgings and precision machining, it provides the ultimate balance of strength, weight, and reliability. Whether you’re doing a routine top-end refresh or chasing more performance, this kit has you covered.

Inside the box, you’ll find everything you need for a full top-end rebuild: piston, rings, wrist pin, circlips, bearing, and gaskets. Wiseco keeps it simple—no hunting for extra parts, no guesswork.

➡️ Why the Wiseco PK1157 Top End Kit Yamaha PW50 rules:

• Made for Yamaha PW50 models 1985–2025
• 40.00mm forged piston = stronger, lighter, longer-lasting
• Dedicated forgings + lightening cuts = optimized power & reliability
• Complete rebuild kit: piston, rings, pin, clips, bearing & gaskets
• Proudly engineered, forged & machined in the USA

➡️ The Wiseco PK1157 Forged Top End Kit Yamaha PW50 isn’t just a piston—it’s performance insurance. Keep your mini machine ripping at its best with the strength and precision trusted by riders worldwide.

❓ FAQ

Q: What bore size is the Wiseco PK1157?
A: This kit includes a 40.00mm forged piston, perfect for PW50 engines.

Q: Does this kit come with everything for a rebuild?
A: Yes! Piston, rings, wrist pin, circlips, bearing, and gaskets are all included.

Q: What bikes does this fit?
A: Designed for all Yamaha PW50 models from 1985 through 2025.