S&S Cycle 2006 BT Dyna 551G Gear Drive Camshaft Kit

This S&S Cycle 551G Gear Drive Camshaft Kit includes the camshafts with inner gears, an outer cam drive gear kit, and a complete camshaft installation kit. It's designed for Harley-Davidson Big Twin engines, specifically for 2006 Dyna models and 2007 through 2016 Big Twin models, fitting engines from 96 to 106 cubic inches with a 9:1 to 10:1 compression ratio. This kit is a bolt-in upgrade for stock or mildly modified touring bikes, aiming to significantly boost low-end and midrange torque, with its strongest performance felt from idle up to 4000 RPM.

The gear drive design is a notable improvement over chain-driven cams because it eliminates timing chain lash, which can affect valve timing accuracy. Plus, there are no tensioner shoes to wear out or fail, offering a more reliable and consistent valve timing setup. The 551G camshaft features a .551 inch lift for both intake and exhaust, with a duration of 216 degrees at 0.053 inches for the intake and 238 degrees for the exhaust. This setup is designed to work with stock valve springs, making installation more straightforward.

This kit is a solid option for riders looking to enhance their motorcycle's performance, particularly in the lower and mid-range power bands where it matters most for cruising and everyday riding. While it's a direct fit for many Harley-Davidson models like the Road King, Street Glide, and Softail Fat Boy, it's important to note that this part is not CARB approved and cannot be shipped to California.