S&S Cycle 509 Cam Kit For Harley Twin Cam 1999-2006

S&S 509: The Torque Specialist for the Classic Twin Cam Era

The S&S Cycle 509 Cam Kit for 1999-2006 Harley-Davidson models represents the 2026 pinnacle of “real-world” engine tuning. While many performance cams focus on high-RPM horsepower that is rarely utilized during touring, the 509 series is designed for the 90% of riding that occurs at cruising speeds. For the rider of an early Twin Cam 88 or a bored-out 95ci engine, the goal is often to eliminate the need for downshifting when overtaking or climbing hills. S&S addresses this by utilizing a specialized lobe profile that builds high cylinder pressure very early in the RPM range. This results in the immediate, “seat-of-the-pants” torque that transforms a stock bike into a high-output 2026 performer. For those seeking secure, industrial-strength utility, the S&S 509 is the most reliable way to gain pulling power without compromising engine longevity.

Precision Geometry and Valvetrain Harmony

What sets S&S Cycle apart in the 2026 marketplace is their mastery of valvetrain harmonics and mechanical integrity. The 509 series features a smooth-ramp design that minimizes mechanical clatter and reduces the stress placed on your hydraulic lifters. Because these cams are optimized for stock compression ratios, they provide excellent starting characteristics and a smooth idle, unlike more aggressive racing profiles. They are ground from premium alloy steel billets and heat-treated to ensure the lobes maintain their surgical precision through years of 2026 summer heat and cross-country tours. This kit is available in both chain-drive and gear-drive configurations, allowing you to choose the level of maintenance-free reliability that suits your riding style. Every cam is laser-inspected and dyno-verified to guarantee that your Stage 2 build delivers consistent, reliable power every time you twist the throttle.

Expert Installation & Performance Advice

As specialists in Twin Cam performance, we recommend the 509 series for any heavy bagger or sidecar application. Pro Tip: To maximize your 2026 torque gains, pair these cams with a high-quality 2-into-1 exhaust system like the Bassani Road Rage. Installation Note: When the cam chest is open, it is the professional standard to replace your inner cam bearings with high-performance Koyo/Torrington units for 2026 reliability. Maintenance Note: If choosing the gear-drive version, you must verify that your crankshaft run-out is within .003″ to ensure quiet operation. Safety Note: Upgrading to a 509 series cam significantly changes the air-fuel demand; a Stage 2 ECU recalibration or carburetor re-jetting is mandatory to prevent lean-running conditions during hot summer rides.

The Professional Standard for Low-End Bagger Power

Choosing S&S Cycle 509 Camshafts means investing in unmatched mechanical efficiency and riding comfort. It offers a unique combination of modern CAD-designed timing and a robust construction that honors the performance legacy of the Harley-Davidson brand. For the rider who wants a high-output 2026 presence and a flawless engineering finish, the S&S 509 is the unmatched leader. Install the cams, feel the torque, and ride the distance.

Features:

• Available in chain drive and gear drive versions
• All chain drive cams include installation kit
• All gear drive cams include 4-gear set and installation kit

509 Cam Info:

• Originally designed as a bolt-in, high-torque cam for 88″ motors with stock compression ratio
• Lower lift allows them to be bolted into some engines with stock valve springs, pushrods, and lifters; high-lift valve springs may be required for some applications
• Compression releases are not necessary with this cam
• Great low and midrange torque
• Strongest from 1,000 RPM-4500 RPM
• Intake open/close 18°/18°
• Exhaust open/close 46°/11°
• Intake duration 216°
• Exhaust duration 237°
• Lift .509″