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S&S 551 Easy Start Cam Kit For Harley Twin Cam 1999-2006
  • S&S 551 Easy Start Cam Kit For Harley Twin Cam 1999-2006 - Chain Drive Cams
  • S&S 551 Easy Start Cam Kit For Harley Twin Cam 1999-2006 - Gear Drive Cams

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Video Reviews (2)

S&S 551 Easy Start Cam Kit For Harley Twin Cam 1999-2006 Videos

This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

S&S Cycle 551 EZ Easy Start Camshaft Kit For Harley Twin Cam

If you've put together a hot bike - or if reliability is paramount - an S&S Easy Start Cam Kit should be on your list. Don't bother fooling with compression releases or massive-output batteries and super-high-buck starters. S&S designed the Easy Start cams with performance in mind, but then revamped the design to give you great power on a cam that starts easier than a dirtbike. At the center of the cam lives a centrifugally retracted, spring loaded compression release lobe milled into the heel of each exhaust lobe. At cranking speeds, the lobe bumps the exhaust valve open slightly during the compression stroke, making the engine much easier to turn over. Once the engine fires and reaches 800 RPM, the lobe swings out of the tappet roller path, allowing the engine to run normally and with full compression. Ain't technology great?


  • Start any engine regardless of displacement or compression ratio with a stock starter
  • Save your starter and battery; tested for 10,000 starts without running battery down
  • Allows for easy start by initially reducing cranking compression, but once the engine starts and rpm increases, the compression release lobe is centrifugally retracted and the engine runs normally, with full compression, and without any loss in performance
  • 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
  • Made in the USA

551 Cam Info:

  • Optimized for 88" to 106" Touring bikes with slip-on mufflers and 9.0 to 10.0:1 compression
  • Can be used with stock pushrods, springs and lifters; high-lift valve springs may be required for some applications
  • Pulls hard from idle to 4000 RPM
  • Similar to Andrews 21H/26H or Screamin' Eagle 203/255
  • Intake open/close 17°/19°
  • Exhaust open/close 41°/17°
  • Intake duration 216°
  • Exhaust duration 238°
  • Lift .550"

Fitment Notes & Exceptions

  • Installer must check for coil bind, valve-to-valve clearance, and valve-to-piston clearance
  • Due to inherent characteristics of gear-driven cams, you may experience greater valve train noise
This Product Fits:
Harley Davidson
Dyna Convertible FXDS 1999, 2000
Dyna Low Rider FXDL/I 19992005
Dyna Super Glide FXD/I 19992005
Dyna Super Glide Sport FXDX 19992005
Dyna Super Glide Sport Touring FXDXT 2001, 2002, 2003
Dyna Wide Glide FXDWG/I 19992005
Electra Glide Classic FLHTC/I 19992006
Electra Glide Standard FLHT/I 19992006
Electra Glide Ultra Classic FLHTCU/I 19992006
Fat Boy FLSTF/I 20002006
Heritage Softail Classic FLSTC/I 20002006
Heritage Softail FLST/I 2006
Heritage Springer FLSTS/I 2000, 2001, 2002, 2003
Night Train FXSTB/I 20002006
Road Glide FLTR/I 19992006
Road King Classic FLHRC/I 19992006
Road King Custom FLHRS/I 19992006
Road King FLHR/I 19992006
Softail Custom/Nostalgia/Special/Deluxe FLSTN/I 2005, 2006
Softail Deuce FXSTD/I 20002006
Softail Springer Classic FLSTSC/I 2005, 2006
Softail Standard FXST/I 20002006
Springer Softail FXSTS/I 20002006
Street Glide FLHX/I 2006
Super Glide Custom FXDC/I 2005
Product Style RevZilla Item # Manufacturer Product # Availability
Gear Drive Cams 959288 106-5442 In Stock: Ships within 24 hours
Chain Drive Cams 959287 106-5293 In Stock: Ships within 24 hours


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S&S 551 Easy Start Cam Kit For Harley Twin Cam 1999-2006
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