S&S 557 Easy Start Cam Kit For Harley Twin Cam 2006-2017
  • S&S 557 Easy Start Cam Kit For Harley Twin Cam 2006-2017 - Chain Drive Cams
  • S&S 557 Easy Start Cam Kit For Harley Twin Cam 2006-2017 - Gear Drive Cams

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Video Reviews (2)

S&S 557 Easy Start Cam Kit For Harley Twin Cam 2006-2017 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 557 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

557 Cam Info:

  • Optimized for Tri-Glides 2009-2011 and heavy bikes needing lots of bottom and mid-range performance
  • 557 has short duration to produce lots of torque
  • Can be used with some engines with stock pushrods, springs and lifters; high-lift valve springs may be required for some applications
  • Intake open/close 6°/27°
  • Exhaust open/close 39°/12°
  • Intake duration 212°
  • Exhaust duration 231°
  • Lift .557"

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
  • High-lift valve springs may be required for some applications
This Product Fits:
Harley Davidson
Dyna Fat Bob FXDF 20082017
Dyna Low Rider FXDL/I 20062009, 20142017
Dyna Low Rider S FXDLS 2016, 2017
Dyna Street Bob FXDB/I 20062017
Dyna Super Glide Custom FXDC/I 20062014
Dyna Super Glide FXD/I 2006, 2007, 2008, 2009, 2010
Dyna Switchback FLD 2012, 2013, 2014, 2015, 2016
Dyna Wide Glide FXDWG/I 20062017
Electra Glide Classic FLHTC/I 20072013
Electra Glide Standard FLHT/I 2007, 2008, 2009
Electra Glide Ultra Classic FLHTCU/I 20072016
Electra Glide Ultra Classic Low FLHTCUL 2015, 2016
Electra Glide Ultra Limited FLHTK 20102016
Electra Glide Ultra Limited Low FLHTKL 2015, 2016
Freewheeler FLRT 2015, 2016
Road Glide Custom FLTRX 2010, 2011, 2012, 2013
Road Glide FLTR/I 2007, 2008, 2009
Road Glide FLTRX 2015, 2016
Road Glide Special FLTRXS 2015, 2016
Road Glide Ultra FLTRU 2011, 2012, 2013, 2016
Road King Classic FLHRC/I 20072013
Road King Custom FLHRS/I 20072012
Road King FLHR/I 20072016
Softail Blackline FXS 2011, 2012, 2013
Softail Breakout FXSB 2013, 2014, 2015, 2016, 2017
Softail Cross Bones FLSTSB 2008, 2009, 2010, 2011
Softail Custom FXSTC/I 2007, 2008, 2009, 2010
Softail Custom/Nostalgia/Special/Deluxe FLSTN/I 20072017
Softail Deuce FXSTD/I 2007
Softail Fat Boy FLSTF/I 20072017
Softail Fat Boy Lo FLSTFB 20092016
Softail Fat Boy S FLSTFBS 2016, 2017
Softail Heritage Classic FLSTC/I 20072017
Softail Night Train FXSTB/I 2007, 2008, 2009
Softail Rocker C FXCWC 2007, 2008, 2009, 2010, 2011
Softail Rocker FXCW 2008, 2009, 2010, 2011
Softail Slim FLS 20122017
Softail Slim S FLSS 2016, 2017
Softail Springer Classic FLSTSC/I 2007
Softail Standard FXST/I 20072012
Street Glide FLHX/I 20072016
Street Glide Special FLHXS 2014, 2015, 2016
Street Glide Trike FLHXXX 2010, 2011
Tri Glide Ultra Classic FLHTCUTG 20092016
Product Style RevZilla Item # Manufacturer Product # Availability
Chain Drive Cams 959314 330-0053 In Stock: Ships within 24 hours
Gear Drive Cams 959315 330-0057 Available: Requires 5-6 business days lead time prior to shipment


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Will these work with factory parts on 2014 street glide 103 ci motor?
A shopper on Feb 4, 2016