WSM 50-541-05K Piston Kit Yamaha Oversize - 400 0.5mm

The WSM 50-541-05K is a complete oversize piston kit engineered for Yamaha 400cc personal watercraft engines. Machined to a +0.5mm oversize specification, this kit is designed for use during engine rebuilds where the cylinder has been bored out to accept an oversized piston, restoring proper compression and performance.

WSM (Water Sports Manufacturing) is a trusted name in aftermarket PWC and marine engine components, producing parts that meet or exceed OEM standards for fit, finish, and durability. This piston kit provides a cost-effective solution for rebuilding worn or damaged Yamaha 400 powerplants.

Key Features:

• +0.5mm oversize piston for use with bored cylinders
• Designed for Yamaha 400cc PWC engines
• Manufactured to OEM or better specifications
• Complete kit includes piston, rings, pin, and clips
• Restores proper compression and engine performance
• WSM quality construction for reliable, long-lasting service

Ideal for professional marine mechanics and DIY rebuilders seeking a reliable, affordable alternative to OEM parts when performing a Yamaha 400 engine overhaul.