Wossner Wössner Piston Kit for Yamaha, 3.817-Inch Bore (4085DA)

The Wössner 4085DA Piston Kit is engineered for Yamaha applications requiring dependable performance, reduced friction, and carefully controlled piston movement. Manufactured from forged aerospace-grade aluminum alloy, this piston combines lightweight construction with the strength needed for demanding engine operation. Its advanced design supports consistent performance while maintaining durability in critical areas of the piston.
The piston features a permanent skirt coating developed to reduce friction and piston rock. This helps promote quieter operation, improved piston stability, and smoother movement within the cylinder. Optimized machining removes unnecessary material while preserving strength in key areas, including the crown and skirt wall cross section. The result is a precisely engineered component designed to support responsive engine performance and long-term reliability.
This complete Wössner piston kit includes the piston, piston rings, wrist pin, and retaining clips for convenient installation. Each component is selected to work together as part of a cohesive replacement or performance rebuild solution. The Wössner 4085DA provides the quality and engineering expected from a specialized piston manufacturer while helping simplify the parts selection process for compatible Yamaha engines.
Designed for builders, technicians, and powersports enthusiasts, this piston kit is a practical choice when replacing worn components or refreshing an engine during a rebuild. Verify vehicle and engine compatibility before installation to ensure proper fitment and performance.

Features:

• Forged aerospace-grade aluminum alloy construction for strength and durability

• Permanent skirt coating helps reduce friction and piston rock

• Optimized machining reduces weight while maintaining strength in critical areas

• Engineered crown and skirt wall cross sections support reliable performance

• Complete kit includes piston, rings, wrist pin, and retaining clips

• Brand: Wössner

• Part Number: 4085DA

• Application: Yamaha

Ships from Parts Unlimited.