Description
The Wiseco B1021 top end bearing is essential for maintaining reliable piston and rod performance in your Kawasaki JS550. Over thousands of engine cycles, factory bearings wear and develop play that compromises power delivery and accelerates secondary damage. This precision-engineered replacement restores original clearances and adds durability through advanced metallurgy and case-hardening, keeping your powerhead running strong at sustained high RPM.
Wiseco’s high-silicon aluminum alloy construction combines lightweight strength with exceptional wear resistance, while the case-hardened surface minimizes friction and extends bearing life even under aggressive racing conditions. Whether you’re rebuilding after years of use or preventing future failure, this bearing delivers the precision fit and reliability that serious jet ski operators depend on.
- High-silicon aluminum alloy
- Case-hardened surface
- Fits Kawasaki JS550 1982-1988
- Reduces friction losses
- Superior wear resistance
- Precision-engineered tolerances
- Manufactured to OEM+ standards
- Optimized for high-RPM applications
