S&S Cycle 509 Cam Kit For Harley Twin Cam 1999-2006
Highway Performance: S&S Cycle 509 Cam Kit for Harley Twin Cam (1999–2006)
The S&S Cycle 509 Cam Kit is engineered as a potent yet street-friendly performance camshaft specifically tailored for the early Harley-Davidson Twin Cam 88 (1999–2006) engine platform. Designed for riders who spend most of their time at speed, the 509 cam is a midrange specialist, providing a significant boost in power that truly comes alive once the RPMs climb past 2,500. This makes it an outstanding choice for Touring, Dyna, and Softail owners who prioritize highway passing power and high-speed cruising capability.
The Midrange Power Advantage
Unlike milder cams that focus solely on low-end grunt, the S&S 509 grind is a strategic upgrade designed to maximize efficiency and power output in the crucial mid-to-upper RPM range, making it the perfect Harley Twin Cam Highway Cam.
Bolt-In Fitment for Stock Compression
The S&S Cycle 509 Cam Kit is designed for compatibility with the stock 88 cubic inch displacement and the factory compression ratio (typically around 8.9:1 or 9.0:1). This allows it to be installed without costly head work, retaining the bike’s reliable performance on readily available pump gas. For most applications within the 1999–2006 Twin Cam range, this cam operates within the safe limits of the stock valve springs, contributing to its reputation as a straightforward and effective Twin Cam Performance Cam 1999-2006.
Gear Drive Option (509G) – The Ultimate Reliability
For riders installing the S&S 509 Cam Kit on the early Twin Cam (1999–2006), the most popular and recommended version is the Gear Drive variant (often designated as 509G).
By converting the engine’s cam drive system from the factory chain and failure-prone tensioners to high-precision S&S Camshaft Drive Gears, riders gain two key advantages:
Eliminated Failure Point: The worry of composite chain tensioner shoes wearing out and contaminating the oil is completely removed, ensuring the ultimate in engine longevity.
Perfect Timing: The gear drive system ensures the cam timing is held absolutely rigid and precise, maximizing the efficiency of the 509 grind and delivering consistent power output.
Note: Installation of any gear drive kit requires checking the crankshaft runout. S&S recommends a maximum runout of 0.003″ for reliable operation.
Essential Supporting Modifications
To fully leverage the significant gains provided by the S&S 509 Cam, supporting modifications are non-negotiable for safe and optimal performance:
Air Cleaner and Exhaust: The engine needs to breathe. A high-flow performance air cleaner and a free-flowing exhaust system (a 2-into-1 design is ideal for mid-range torque) are required to feed and expel the increased volume of air and fuel.
Tuning: For all 1999–2006 models, whether carbureted or equipped with early EFI, the air/fuel mixture and ignition timing must be adjusted to match the new cam profile. A proper dyno tune using a suitable fuel management system is mandatory to prevent overheating and ensure peak performance and reliability.
The S&S Cycle 509 Cam Kit is the perfect choice for the experienced rider looking for a significant, reliable, and install-friendly power boost focused on the sweet spot of high-speed cruising and powerful highway performance for their Harley Twin Cam 88.
| Product Style | AmericanV-twin Item # | Catalog Number | Store Sku | MFR. Product # | Availability |
|---|---|---|---|---|---|
| Chain Drive Cams | 959496 | 446-409 | 330-0016 | In Stock: Ships within 24 hours | |
| Gear Drive Cams | 959495 | 362-708 | 330-0017 | In Stock: Ships next business day |
This Product Fits
Harley Davidson
Dyna Convertible FXDS 1999, 2000
Dyna Low Rider FXDL/I 1999-2005
Dyna Super Glide Custom FXDC/I 2005
Dyna Super Glide FXD/I 1999-2005
Dyna Super Glide Sport FXDX 1999-2005
Dyna Super Glide Sport Touring FXDXT 2001, 2002, 2003
Dyna Wide Glide FXDWG/I 1999-2005
Electra Glide Classic FLHTC/I 1999-2006
Electra Glide Standard FLHT/I 1999-2006
Electra Glide Ultra Classic FLHTCU/I 1999-2006
Road Glide FLTR/I 1999-2006
Road King Classic FLHRC/I 1999-2006
Road King Custom FLHRS/I 2004, 2005, 2006
Road King FLHR/I 1999-2006
Softail Deluxe FLSTN/I 2005, 2006
Softail Deuce FXSTD/I 2000-2006
Softail Fat Boy FLSTF/I 2000-2006
Softail Heritage Classic FLSTC/I 2000-2006
Softail Heritage FLST/I 2006
Softail Heritage Springer FLSTS/I 2000, 2001, 2002, 2003
Softail Night Train FXSTB/I 2000-2006
Softail Springer Classic FLSTSC/I 2005, 2006
Softail Springer FXSTS/I 2000-2006
Softail Standard FXST/I 2000-2006
Street Glide FLHX/I 2006
