1250cc Big Bore Conversion Kits / '86-'22 Sportster

Revolutionize your Harley Sportster with the ultimate upgrade: the S&S Cycles 1250cc Conversion Kit. Tailored for the true enthusiast, this kit is your gateway to unmatched performance and the roar of real power. Featuring 10.3:1 flat top pistons, this comprehensive package ensures a seamless transformation of your ride into a formidable beast on the road.

Kit Highlights:

• High-Performance Pistons: S&S 1250cc pistons with rings and wristpins, designed for peak performance.
• Precision Engineered Cylinders: S&S 3-9/16" bore cylinders for a significant boost in displacement and power.
• Enhanced Valve Compatibility: Forged pistons with enlarged valve pockets, accepting up to 2.00" valves for superior airflow.
• Quality and Durability: Forged pistons feature coated skirts with a measurement window and the iconic S&S logo, promising long-lasting performance.
• Comprehensive Gasket Set: Includes MLS head, base, and exhaust gaskets, ensuring a perfect seal and optimum reliability.
• Easy Installation: Comes with assembly lube and clear instructions for a hassle-free upgrade process.

Proudly Made in the U.S.A. Crafted with precision and pride, this kit embodies the spirit of American engineering, offering you the quality and durability S&S Cycles is known for.

Please Note:

• 883 models will need XL1200 cylinder heads to achieve the correct compression ratios, ensuring a perfect match for your upgrade.
• This kit is not compatible with XR1200 models