640 Easy Start Camshaft Kit — Chain, S&S CYCLE 330-0331

S&S CYCLE 640 Easy Start Camshaft Kit — Chain, S&S CYCLE 330-0331 – 08, 10-16 Dyna, 07-15 CVO, 10-16 Trike, 10-11 Touring, 07-16 Softail

S&S CYCLE
0925-0831
330-0331

Reduces crank compression for easier starts, then restores full compression for normal running. Fits 95", 96", 103" and 110" engines with 10.5:1–11.5:1 compression; requires high-lift springs and adjustable pushrods. Not for models with OEM compression releases.

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The 640 Easy Start camshaft kit reduces crank compression during starting, with a centrifugal compression release that retracts as rpm increases so the engine runs with full compression and without loss of performance. ⚙️

  • Intended for 95", 96", 103" and 110" engines with compression ratios between 10.5:1 and 11.5:1; strongest power band from 3,000–6,000 rpm.
  • Made in the USA.
  • Requires high-lift springs and adjustable pushrods.
  • Not for models with OEM compression releases.
  • Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance before installation. ✅

Recommended for riders who want easier starts without sacrificing midrange performance.

: 0925-0831
In Stock

Data sheet

Type
Chain
Units
Kit
Brand
S&S CYCLE
Application
Exhaust, Intake
Grind
635 Series
Exhaust Close
37.5°
Exhaust Duration
276°
Exhaust Lift
0,635"
Exhaust Open
58.5°
Intake Close
43.5°
Intake Duration
243°
Intake Lift
0,635"
Intake Open
19,5°
Harley Family
CVO
Dyna
Softail
Touring
Trike

This product fits the following vehicles. Use the filters below to narrow down the list if needed.

Manufacturer Model Family Year Notes
Harley Davidson Dyna Switchback Dyna 2012
Harley Davidson Dyna Switchback Dyna 2013
Harley Davidson Dyna Switchback Dyna 2012
Harley Davidson Dyna Switchback Dyna 2013
Harley Davidson Dyna Switchback Dyna 2014
Harley Davidson Dyna Switchback Dyna 2015
Harley Davidson Dyna Switchback Dyna 2016
Harley Davidson Road King Screamin Eagle CVO 2007
Harley Davidson Electra Glide Ultra Classic Screamin Eagle CVO 2007
Harley Davidson Trike Tri Glide Ultra Classic Trike 2010
Harley Davidson Trike Tri Glide Ultra Classic Trike 2011
Harley Davidson Trike Tri Glide Ultra Classic Trike 2012
Harley Davidson Trike Tri Glide Ultra Classic 110th Anniversary Trike 2013
Harley Davidson Trike Tri Glide Ultra Classic Trike 2014
Harley Davidson Trike Tri Glide Ultra Classic Trike 2015
Harley Davidson Trike Tri Glide Ultra Classic Trike 2016
Harley Davidson Trike Street Glide Touring 2010
Harley Davidson Trike Street Glide Touring 2011
Harley Davidson Freewheeler Trike 2015
Harley Davidson Freewheeler Trike 2016
Harley Davidson Softail Slim Softail 2012
Harley Davidson Softail Slim Softail 2013
Harley Davidson Softail Slim Softail 2015
Harley Davidson Softail Slim Softail 2016
Harley Davidson Softail Slim Softail 2014
Harley Davidson Softail Slim Softail 2015
Harley Davidson Softail Slim Softail 2016
Harley Davidson Softail Slim S Softail 2016
Harley Davidson Heritage Softail Classic Softail 2014
Harley Davidson Heritage Softail Classic Softail 2016
Harley Davidson Fat Boy Softail 2014
Harley Davidson Fat Boy Softail 2016
Harley Davidson Fat Boy Special Softail 2010
Harley Davidson Fat Boy Special Softail 2011
Harley Davidson Fat Boy Special Softail 2012
Harley Davidson Fat Boy Special 110th Anniversary Softail 2013
Harley Davidson Fat Boy Special Softail 2014
Harley Davidson Fat Boy Special Softail 2015
Harley Davidson Fat Boy Special Softail 2016
Harley Davidson Fat Boy S Softail 2016
Harley Davidson Softail Deluxe Softail 2014
Harley Davidson Softail Deluxe Softail 2016
Harley Davidson Softail Deluxe CVO CVO 2014
Harley Davidson Softail Deluxe CVO CVO 2015
Harley Davidson Cross Bones Springer Softail 2008
Harley Davidson Cross Bones Springer Softail 2009
Harley Davidson Cross Bones Springer Softail 2010
Harley Davidson Cross Bones Springer Softail 2011
Harley Davidson Softail Springer Classic Softail 2007
Harley Davidson Softail Convertible CVO CVO 2010
Harley Davidson Softail Convertible CVO CVO 2011
Harley Davidson Softail Convertible CVO CVO 2011
Harley Davidson Softail Convertible CVO CVO 2012
Harley Davidson Rocker Softail 2008
Harley Davidson Rocker Softail 2009
Harley Davidson Rocker C Softail 2008
Harley Davidson Rocker C Softail 2009
Harley Davidson Rocker C Softail 2010
Harley Davidson Rocker C Softail 2011
Harley Davidson Rocker C Softail 2011
Harley Davidson Dyna Street Bob Dyna 2008
Harley Davidson Dyna Street Bob Dyna 2014
Harley Davidson Dyna Street Bob Dyna 2015
Harley Davidson Dyna Street Bob Dyna 2016
Harley Davidson Dyna Street Bob Limited Dyna 2016
Harley Davidson Dyna Street Bob Limited Dyna 2016
Harley Davidson Dyna Street Bob Factory Custom Dyna 2016
Harley Davidson Dyna Street Bob Factory Custom Dyna 2016
Harley Davidson Dyna Super Glide Custom Dyna 2010
Harley Davidson Dyna Super Glide Custom Dyna 2013
Harley Davidson Dyna Super Glide Custom Dyna 2012
Harley Davidson Dyna Super Glide Custom Dyna 2014
Harley Davidson Dyna Fat Bob Dyna 2011
Harley Davidson Dyna Fat Bob Dyna 2014
Harley Davidson Dyna Fat Bob Dyna 2015
Harley Davidson Dyna Fat Bob Dyna 2016
Harley Davidson Dyna Fat Bob Dyna 2014
Harley Davidson Dyna Fat Bob Dyna 2015
Harley Davidson Dyna Fat Bob Dyna 2016
Harley Davidson Dyna Fat Bob CVO CVO 2009
Harley Davidson Dyna Fat Bob CVO CVO 2010
Harley Davidson Dyna Low Rider Dyna 2008
Harley Davidson Dyna Low Rider Dyna 2014
Harley Davidson Dyna Low Rider Dyna 2015
Harley Davidson Dyna Low Rider Dyna 2016
Harley Davidson Dyna Low Rider Dyna 2014
Harley Davidson Dyna Low Rider Dyna 2015
Harley Davidson Dyna Low Rider Dyna 2016
Harley Davidson Dyna Low Rider S Dyna 2016
Harley Davidson Dyna Screamin Eagle CVO 2007
Harley Davidson Dyna Screamin Eagle CVO 2008
Harley Davidson Dyna Wide Glide 105th Anniversary Dyna 2008
Harley Davidson Dyna Wide Glide Dyna 2011
Harley Davidson Dyna Wide Glide Dyna 2012
Harley Davidson Dyna Wide Glide Dyna 2012
Harley Davidson Dyna Wide Glide Dyna 2013
Harley Davidson Dyna Wide Glide Dyna 2013
Harley Davidson Dyna Wide Glide Dyna 2014
Harley Davidson Dyna Wide Glide Dyna 2015
Harley Davidson Dyna Wide Glide Dyna 2016
Harley Davidson Blackline Softail 2011
Harley Davidson Blackline Softail 2011
Harley Davidson Blackline Softail 2012
Harley Davidson Blackline Softail 2012
Harley Davidson Blackline Softail 2013
Harley Davidson Blackline Softail 2012
Harley Davidson Blackline Softail 2013
Harley Davidson Breakout Softail 2013
Harley Davidson Breakout Softail 2013
Harley Davidson Breakout Softail 2014
Harley Davidson Breakout Softail 2015
Harley Davidson Breakout Softail 2016
Harley Davidson Breakout CVO CVO 2013
Harley Davidson Breakout CVO CVO 2014
Harley Davidson Softail Night Train Softail 2007
Harley Davidson Softail Night Train Softail 2009
Harley Davidson Softail Custom Softail 2008
Harley Davidson Softail Springer Screamin Eagle CVO 2007
Harley Davidson Softail Springer Screamin Eagle CVO 2008
Harley Davidson Softail Springer CVO CVO 2009