S&S CYCLE Big Bore Cylinder Kit — 4.125 in bore, 124 cu in displacement – 08-15 Dyna, 10-11, 13-14 Touring, 07-15 CVO, 10-15 Trike, 07-15 Softail

Upgrade your engine with a proven big bore cylinder kit that delivers excellent results using stock cylinder heads. 🔧🔥

Installation is straightforward: swap the cylinders—no boring or case splitting required unless otherwise noted.

Cylinders are constructed from premium aluminum castings with cast-in iron liners for long-lasting performance.

The kit includes cylinders, pistons, rings and gaskets (head, base and exhaust) and is made in the USA. 🇺🇸

This project requires a skilled technician; the assembler is responsible for checking all clearances and assembly specifications.

Will fit Twin Cooled motors; requires case machining for installation. Not for '16 Street Glide Special.