Wiseco Pistons WK1143 Forged Piston Kit Polaris - SL900 1996-1997 75mm

The Wiseco WK1143 is a forged replacement piston designed for the Polaris SL900 personal watercraft (1996–1997). Sized at 75mm (2.953") with a 687M designation, this piston is manufactured to exacting tolerances for reliable performance in demanding two-stroke applications.

Key Features:

• Forged High-Silicon Aluminum Construction: Wiseco pistons are forged from high-silicon, low-expansion aluminum alloy, delivering superior strength, reduced reciprocating weight, improved heat transfer, and extended service life compared to cast alternatives.
• Diamond-Turned CNC Finish: Each piston receives a diamond-turned finish from CNC turning centers, ensuring precise sizing with no variation — critical for proper ring seal and long-term durability.
• Compatible with Multiple Cylinder Bore Types: Engineered for use in cast iron, chrome, Nikasil, and boron composite cylinder bores, allowing confident installation across a wide range of cylinder compositions.
• Oversize Availability: Part of Wiseco's extensive oversize piston lineup, allowing restoration of worn cast iron cylinders to factory-tight clearances. Compatible with replacement sleeves for chrome, Nikasil, and boron composite cylinders.
• 75mm Bore / 2953 Series: Matches OEM bore specification for the Polaris SL900 engine, making it suitable for standard rebuilds or slight overbore applications depending on configuration.

Wiseco is a trusted name in high-performance forged pistons for powersports, motorsport, and marine applications. The WK1143 is engineered to meet the demands of both competitive use and recreational riding, providing the precision fit and durability expected from a premium forged piston kit.