{"product_id":"s-s-cycle-1250cc-conversion-kit-black-10-3-1-for-sportster-86-21","title":"S\u0026S Cycle 1250cc Conversion Kit Black 10.3:1 for Sportster 86-21","description":"\u003cp\u003eUnleash the full potential of your Harley-Davidson Sportster with the high-performance \u003cstrong\u003eS\u0026amp;S Cycle 1250cc conversion kit\u003c\/strong\u003e. Engineered to transform '86-'21 883cc and 1200cc Sportster models, this kit delivers a significant boost in displacement and power, providing an exhilarating riding experience.\u003c\/p\u003e\n\u003ch2\u003eDescription\u003c\/h2\u003e\n\u003cp\u003eThe S\u0026amp;S Cycle 1250cc conversion kit is meticulously designed to elevate your Sportster's engine performance without the need for extensive modifications. This comprehensive \u003cstrong\u003eSportster big bore kit\u003c\/strong\u003e converts your existing 883cc or 1200cc engine to a powerful 1250cc displacement. At its core are premium forged pistons, engineered with larger-than-stock valve pockets capable of accommodating up to 2.00\" valves, allowing for future head upgrades and enhanced airflow. These pistons feature coated skirts for reduced friction and extended durability, along with a convenient measurement window and the iconic S\u0026amp;S logo. Installation is streamlined, as this kit requires no machining or rebalancing of your engine, making it a straightforward \u003cstrong\u003eHarley-Davidson Sportster engine upgrade\u003c\/strong\u003e for experienced mechanics and DIY enthusiasts. The kit includes S\u0026amp;S 3-9\/16\" bore cylinders, MLS (Multi-Layer Steel) head, base, and exhaust gaskets for a reliable, leak-free seal, along with all necessary rings, wristpins, assembly lube, and detailed instructions. Proudly \u003cstrong\u003eMade in the USA\u003c\/strong\u003e, this S\u0026amp;S Cycle kit ensures superior quality and a precise fit for a significant \u003cstrong\u003eengine displacement increase\u003c\/strong\u003e, transforming your ride into a true powerhouse.\u003c\/p\u003e\n\u003ch2\u003eFeatures \u0026amp; Highlights\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSignificant Displacement Increase:\u003c\/strong\u003e Converts 1986-2021 883cc and 1200cc Sportster models to a powerful 1250cc engine, dramatically boosting torque and horsepower.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePremium Forged Pistons:\u003c\/strong\u003e Equipped with coated skirts for enhanced durability and reduced friction, featuring larger valve pockets to accept up to 2.00\" valves for maximum performance potential.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHassle-Free Installation:\u003c\/strong\u003e Designed for direct bolt-on application, eliminating the need for complex machining or rebalancing of your engine.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Includes S\u0026amp;S 1250cc pistons, rings, wristpins, 3-9\/16\" bore cylinders, MLS (Multi-Layer Steel) head, base, and exhaust gaskets, plus assembly lube and instructions for a seamless upgrade.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDurable Gasket Technology:\u003c\/strong\u003e Utilizes MLS (Multi-Layer Steel) gaskets for superior sealing, ensuring long-term reliability and performance.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAmerican Made Quality:\u003c\/strong\u003e Manufactured in the USA, guaranteeing top-tier materials and craftsmanship for your Sportster.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003eBrand: S\u0026amp;S Cycle\u003c\/li\u003e\n    \u003cli\u003eDisplacement: 1250 cc\u003c\/li\u003e\n    \u003cli\u003eBore Size: 3-9\/16\"\u003c\/li\u003e\n    \u003cli\u003ePiston Type: Forged with coated skirts\u003c\/li\u003e\n    \u003cli\u003eValve Pocket Compatibility: Accepts up to 2.00\" valves\u003c\/li\u003e\n    \u003cli\u003eGasket Type: MLS (Multi-Layer Steel)\u003c\/li\u003e\n    \u003cli\u003eCompression Ratio: 10.3:1 (Estimated)\u003c\/li\u003e\n    \u003cli\u003eColor\/Finish: Black\u003c\/li\u003e\n    \u003cli\u003eCountry of Origin: USA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEAN:\u003c\/strong\u003e 09310526\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eImportant to Know\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003eWill not work with Harley-Davidson XR1200 models.\u003c\/li\u003e\n    \u003cli\u003e883cc Sportster models will require the use of XL1200 cylinder heads to achieve correct compression ratios.\u003c\/li\u003e\n    \u003cli\u003eFor optimal performance, CNC head porting, performance cams, upgraded exhaust, and intake components are recommended (not included in kit).\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":63699856032074,"sku":"09310526","price":8439.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0971\/0016\/9546\/files\/24b886c214af233e9afe0f750002ee83.webp?v=1790463810","url":"https:\/\/partsdenmark.dk\/products\/s-s-cycle-1250cc-conversion-kit-black-10-3-1-for-sportster-86-21","provider":"Parts Denmark","version":"1.0","type":"link"}