S&S Cycle 99-06 BT Easy Start 640GE Gear Drive Camshaft Kit

This S&S Cycle kit includes the inner gears and an outer cam drive gear kit, giving you everything needed to upgrade your engine's camshaft system. It's designed for 1999-2006 Harley-Davidson Big Twin models, excluding the 2006 Harley-Davidson Dyna. This gear drive setup is a significant improvement over stock chain-driven cams because it eliminates timing chain lash, which greatly improves valve timing accuracy. This means your engine's valves will open and close precisely when they're supposed to, leading to more consistent performance.

The 640GE cam is specifically intended for engines 95 cubic inches or larger, with compression ratios ranging from 10.5:1 to 11.5:1. It's a popular choice for builders working with S&S 124 cubic inch engines. While these cams offer improved timing accuracy and allow your stock starter to turn over even modified engines, it's important to note that they are not a simple bolt-in installation. They require special valve springs to be installed correctly. This upgrade is a solid option for those looking to fine-tune their engine's performance and reliability.