S&S Cycle 1250 Big Bore Kit For Harley Sportster 1986-2022

S&S 1250 Big Bore Kit For Harley Sportster 

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.

Features:

• 10.3:1 Flat Top Pistons
• 11.2:1 5.5cc Domed Pistons
• Available in silver powder coat or wrinkle black powder coat finish
• Made in the USA