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The KB Performance Piston Kit part number KB411.STD is designed for high-performance Twin Cam engines with a 95-inch bore. Crafted from high-strength T-5 heat-treated 390 hypereutectic aluminum alloy, these pistons offer exceptional durability and heat resistance. They enable a tighter fit within the cylinder, which translates to improved ring seal and longer piston and ring life, making them ideal for demanding riding conditions and performance applications. The pistons are diamond-machined, ensuring precision weight matching within one gram and tolerances of less than half a thousandth of an inch, guaranteeing smooth operation and balanced engine performance. Each kit includes two pistons, pins, spiral-lock pin clips, and Hastings moly rings (rings sold separately), providing everything needed for a complete installation. KB pistons can be installed tighter than conventional options, reducing piston rock and enhancing engine efficiency. Proper piston clearance and ring end gap are critical; detailed instructions are included to ensure correct installation and optimal performance. Due to the thermal conductivity and design specifics of KB pistons, special attention should be paid during ring installation to prevent issues and maximize longevity. This piston kit is a reliable choice for enthusiasts seeking to upgrade their Twin Cam engine with high-quality components that promote durability and performance.
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