This big bore cylinder and piston kit contains S&S 4-1/8" bore cylinders and forged flat topped pistons, rings, wrist pins, head and base gaskets. The cylinders are machined with the stock bolt pattern and are intended for use in crankcases* of 2007-'17 big twin except 2017 touring engines. The stock 4-3/8" stroke and 4-1/8" bore result in a 117' displacement. Cylinder finish is a durable wrinkle black powder coat. This cylinder kit may be used with Harley** or S&S cylinder heads with stock bolt pattern. For best performance, appropriate camshafts, performance air cleaner, performance exhaust and fuel system tuning are required. Although not mandatory, we recommend adding an oil cooler to bikes ridden in warmer climates
*Crankcases must be bored to accept the larger 4-1/8" bore cylinders.
**When using Harley® Twin Cooled® heads, part number 900-0609 will have to be used.
Not recommended for Tri-Glide or other three wheel models including conversion due to lugging nature of these bikes.
