S&S CYCLE Big Bore Cylinder Kit — Bore 4.250" , Displacement 128" , Stroke 4.500" – 18-23 CVO, 18, 22-23 Touring

Upgrade your engine with this big bore cylinder kit for notable performance gains. 🔧

This kit yields excellent results with stock cylinder heads and installs easily — no need to bore or split existing cases; simply swap the cylinders unless otherwise noted.

• Cylinders feature premium cast construction with durable, cast-in liners for long life.
• The kit includes cylinders, pistons, rings and a full gasket set (head, base and exhaust).
• Made in the USA 🇺🇸.

This is a precision project that requires a skilled technician; the installer is responsible for verifying all clearances and assembly specifications. Not recommended for trike models. 🙂