Bronco AT-09478 Big Bore Cylinder for Polaris 800

The Bronco AT-09478 is a high-performance big bore replacement cylinder designed specifically for Polaris 800 snowmobile engines. This precision-engineered cylinder provides a direct OEM replacement solution with enhanced displacement for improved power output.

Key Features:

• Cast from AB4C aluminum alloy for superior strength and heat dissipation
• Nikasil-plated sleeves provide excellent wear resistance and long-term durability
• Designed to match OEM specifications in appearance and fitment
• Requires no case modification for installation—direct bolt-on application
• Big bore design increases engine displacement for enhanced performance
• Precision machining ensures proper piston-to-cylinder clearances

This cylinder is engineered to deliver reliable performance in demanding snowmobile applications while maintaining the quality standards expected from OEM components. The nikasil plating process creates an exceptionally hard, low-friction surface that resists scoring and extends service life.