This kit converts 1200cc HD Sportster models to 1250cc displacement. No machining or rebalancing is required. Forged pistons have larger than stock valve pockets and accept up to 2.00″ valves. Kit contains forged flat topped 3- 9/16″ bore pistons with coated piston skirts, S&S 3-9/16″ bore cylinders, MLS head gaskets, base gaskets, exhaust gaskets, assembly lube, and instructions.

• Forged pistons – coated piston skirts with measurement window and S & S logo
• Forged pistons have larger than stock valve pockets and accepts up to 2.00″ valves
• 10.3:1 compression ratio
• Available in silver powder coat or wrinkle black powder coat finish
• Kit includes S & S 1250cc pistons with rings and wristpins, S & S 39/16″ bore cylinders, MLS head, base and exhaust gaskets, assembly lube and instructions
• Made in the U.S.A.
• MFG Part #910-0443