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The KB Performance Piston Kit, model KB297.010, is designed for Harley Big Twin engines with a 4.250-inch stroke. Crafted from high-strength T-5 heat-treated 390 hypereutectic aluminum alloy, these pistons offer a durable and reliable solution for performance upgrades. The advanced diamond-machining process ensures tight tolerances and precise weight matching, reducing piston rock and enhancing ring seal for improved engine efficiency and longevity. This kit includes two pistons, pins, spiral-lock pin clips, and Hastings moly rings, providing a comprehensive package for installation.
Each piston is engineered for a tighter fit than standard options, which translates into longer piston and ring life. Proper piston clearance is critical; therefore, it is essential to follow the included instructions to achieve optimal performance. Due to the pistons' superior thermal conductivity and specific design features, special attention must be paid to the top ring end gap during installation. Correct ring installation ensures optimal sealing and engine performance.
Designed for enthusiasts seeking to maximize their Harley Big Twin's performance, the KB297.010 kit offers a combination of durability, precision, and ease of installation. Replacement rings and pin lock rings are available separately, allowing for maintenance and customization as needed. Whether building a high-performance engine or restoring a stock setup, these pistons provide a reliable foundation for your project.
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