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The KB Performance Piston Kit for XL883 to 1200 conversions is engineered from high-strength T-5 heat-treated 390 hypereutectic aluminum alloy, ensuring durability and optimal performance. This material choice allows for a tighter fit between the piston and cylinder, promoting longer piston and ring life while reducing piston rock. The diamond-machined pistons are manufactured to strict tolerances, with weights held to within plus or minus one gram and dimensional tolerances less than half a thousandth of an inch (.0005"), guaranteeing uniformity and precision in engine assembly. Each kit includes two pistons, pins, spiral-lock pin clips, and Hastings moly rings (rings sold separately), providing a comprehensive upgrade for your engine rebuild or modification. KB pistons are designed to be installed tighter than conventional pistons, which results in improved ring sealing and enhanced engine performance. Due to the thermal conductivity and specific design of KB pistons, special attention must be paid to the top ring end gap during installation. Proper ring gap clearance is essential for optimal function and longevity, and detailed instructions are included to guide correct piston clearance and ring installation. Engine builders and enthusiasts will appreciate the meticulous manufacturing standards and the performance benefits provided by this piston kit, making it a reliable choice for high-performance motorcycle engine upgrades.
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