551 Easy Start Camshaft Kit — 551 Series, chain

S&S CYCLE 551 Easy Start Camshaft Kit — 551 Series, chain – 06-16 Dyna, 03, 07-16 Touring, 07-15 CVO, 10-16 Trike, 07-16 Softail

S&S CYCLE
0925-0443
106-4947
Reduces crank compression for easier starting, then returns to full compression for normal performance. Bolt-in for 88"–106" Touring bikes with slip-on mufflers. Improves low-end and midrange torque. Not for OEM compression releases or compression ratios ≥10.0:1.
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€425.73
€535.20
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You can return the products within 14 days for a full refund, check our returns policy.

Make starting effortless without sacrificing performance. The 551 Easy Start Camshaft Kit reduces crank compression momentarily for easier cranking; once the engine fires and rpm rises, the compression-release lobe retracts centrifugally so the engine runs with full compression and no loss in power. 🏍️

Designed to work especially well on 88"/96"/103" to 106" Touring bikes fitted with slip-on mufflers and compression ratios from 9.0:1 to 9.9:1, this bolt-in kit greatly improves low-end and midrange torque and is strongest from idle to 4,000 rpm.

  • Simple bolt-in installation for stock or mildly modified Touring models.
  • Delivers noticeable improvement to starting effort and rideability in the most commonly used rpm range.
  • Includes camshafts, gearcover gasket, bearings, retaining ring, o-ring, thread lock and instructions.
  • Made in the USA.

Important: Not recommended for compression ratios of 10.0:1 or greater. Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance. Not for models with OEM compression releases. Can be used with stock pushrods, lifters, and springs unless noted.

: 0925-0443
: 14 Items
In Stock

Data sheet

Type
Chain
Units
Kit
Brand
S&S CYCLE
Application
Exhaust, Intake
Grind
551 Series
Exhaust Close
17°
Exhaust Duration
237°
Exhaust Lift
0,550"
Exhaust Lift at TDC
0,170"
Exhaust Lobe Centerline
102°
Exhaust Open
41°
Intake Close
19°
Intake Duration
215°
Intake Lift
0,550"
Intake Lift at TDC
0,178"
Intake Lobe Centerline
91°
Intake Open
17°

Shipping Policy

Shipping Areas:

We ship to:

  • Spain (Peninsula and Balearic Islands)
  • European Union countries

We do not ship to the Canary Islands, Ceuta, or Melilla.

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  • Balearic Islands: 3–5 business days
  • EU countries: 3–7 business days depending on destination

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Orders are processed within 1–2 business days after payment confirmation. Orders placed on weekends or public holidays are processed the next business day.

Delivery Issues:

If your order is delayed or arrives damaged, you must notify us within 14 calendar days. We will investigate the issue and offer a resolution in accordance with applicable consumer protection laws.

Return & Withdrawal Policy

Right of Withdrawal:

In accordance with Royal Legislative Decree 1/2007 (Ley de Defensa de los Consumidores y Usuarios), you have the right to withdraw from your purchase within 14 calendar days from the date of receipt, without giving any reason.

To exercise this right, contact us via email or through our website, providing your order number and contact details.

Return Conditions:

  • Products must be unused, in original condition and packaging.
  • Return shipping costs are the responsibility of the customer, unless the product is defective or sent in error.
  • Refunds will be issued within 14 days of receiving the returned goods.

Items Excluded from Return:

  • Custom or personalized products
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If you want to return an item, please contact us first to give you detailed instructions.

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
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Harley Davidson Road King Touring 2007
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Harley Davidson Road King CVO Touring 2013
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Harley Davidson Electra Glide Classic Touring 2011
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Harley Davidson Electra Glide Ultra Classic Touring 2007
Harley Davidson Electra Glide Ultra Classic Touring 2009
Harley Davidson Electra Glide Ultra Classic Touring 2010
Harley Davidson Electra Glide Ultra Classic Touring 2011
Harley Davidson Electra Glide Ultra Classic Touring 2008
Harley Davidson Electra Glide Ultra Classic Touring 2009
Harley Davidson Electra Glide Ultra Classic Touring 2010
Harley Davidson Electra Glide Ultra Classic Touring 2011
Harley Davidson Electra Glide Ultra Classic Touring 2012
Harley Davidson Electra Glide Ultra Classic Touring 2013
Harley Davidson Electra Glide Ultra Classic Touring 2012
Harley Davidson Electra Glide Ultra Classic Touring 2013
Harley Davidson Electra Glide Ultra Classic Touring 2014
Harley Davidson Electra Glide Ultra Classic Touring 2015
Harley Davidson Electra Glide Ultra Classic Touring 2016
Harley Davidson Electra Glide Ultra Classic Low Touring 2015
Harley Davidson Electra Glide Ultra Classic Low Touring 2016
Harley Davidson Electra Glide Ultra Classic Screamin Eagle CVO 2007
Harley Davidson Electra Glide Ultra Classic Screamin Eagle CVO 2008
Harley Davidson Electra Glide Ultra Classic CVO CVO 2009
Harley Davidson Electra Glide Ultra Classic CVO CVO 2010
Harley Davidson Electra Glide Ultra Classic CVO CVO 2011
Harley Davidson Electra Glide Ultra Classic CVO CVO 2012
Harley Davidson Electra Glide Ultra Classic CVO 110th Anniversary CVO 2013
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 Electra Glide Ultra Limited Touring 2010
Harley Davidson Electra Glide Ultra Limited Touring 2011
Harley Davidson Electra Glide Ultra Limited Touring 2011
Harley Davidson Electra Glide Ultra Limited Touring 2012
Harley Davidson Electra Glide Ultra Limited Touring 2013
Harley Davidson Electra Glide Ultra Limited Touring 2014
Harley Davidson Electra Glide Ultra Limited Touring 2015
Harley Davidson Electra Glide Ultra Limited Touring 2016
Harley Davidson Electra Glide Ultra Limited Low Touring 2015
Harley Davidson Electra Glide Ultra Limited Low Touring 2016
Harley Davidson Electra Glide Ultra Limited CVO CVO 2014
Harley Davidson Electra Glide Ultra Limited CVO CVO 2015
Harley Davidson Street Glide Touring 2007
Harley Davidson Street Glide Touring 2008
Harley Davidson Street Glide Touring 2009
Harley Davidson Street Glide Touring 2010
Harley Davidson Street Glide Touring 2011
Harley Davidson Street Glide Touring 2008
Harley Davidson Street Glide Touring 2009
Harley Davidson Street Glide Touring 2010
Harley Davidson Street Glide Touring 2011
Harley Davidson Street Glide Touring 2011
Harley Davidson Street Glide Touring 2012
Harley Davidson Street Glide Touring 2013
Harley Davidson Street Glide Touring 2014
Harley Davidson Street Glide Touring 2015
Harley Davidson Street Glide Touring 2016
Harley Davidson Street Glide Touring 2011
Harley Davidson Street Glide Touring 2012
Harley Davidson Street Glide Touring 2013
Harley Davidson Street Glide Touring 2014
Harley Davidson Street Glide Touring 2015
Harley Davidson Street Glide Touring 2016
Harley Davidson Street Glide Special Touring 2014
Harley Davidson Street Glide Special Touring 2015
Harley Davidson Street Glide Special Touring 2016
Harley Davidson Street Glide CVO CVO 2010
Harley Davidson Street Glide CVO CVO 2015
Harley Davidson Street Glide CVO CVO 2011
Harley Davidson Street Glide CVO CVO 2012
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 2014
Harley Davidson Softail Slim Softail 2015
Harley Davidson Softail Slim Softail 2016
Harley Davidson Softail Slim Softail 2012
Harley Davidson Softail Slim Softail 2013
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 2007
Harley Davidson Heritage Softail Classic Softail 2008
Harley Davidson Heritage Softail Classic Softail 2009
Harley Davidson Heritage Softail Classic Softail 2010
Harley Davidson Heritage Softail Classic Softail 2011
Harley Davidson Heritage Softail Classic Softail 2011
Harley Davidson Heritage Softail Classic Softail 2012
Harley Davidson Heritage Softail Classic Softail 2013
Harley Davidson Heritage Softail Classic Softail 2012
Harley Davidson Heritage Softail Classic Softail 2013
Harley Davidson Heritage Softail Classic Softail 2014
Harley Davidson Heritage Softail Classic Softail 2015
Harley Davidson Heritage Softail Classic Softail 2016
Harley Davidson Fat Boy Softail 2007
Harley Davidson Fat Boy Softail 2008
Harley Davidson Fat Boy Softail 2009
Harley Davidson Fat Boy Softail 2010
Harley Davidson Fat Boy Softail 2011
Harley Davidson Fat Boy Softail 2011
Harley Davidson Fat Boy Softail 2012
Harley Davidson Fat Boy Softail 2013
Harley Davidson Fat Boy Softail 2014
Harley Davidson Fat Boy Softail 2012
Harley Davidson Fat Boy Softail 2013
Harley Davidson Fat Boy Softail 2014
Harley Davidson Fat Boy Softail 2015
Harley Davidson Fat Boy Softail 2016
Harley Davidson Fat Boy Special Softail 2010
Harley Davidson Fat Boy Lo Softail 2011
Harley Davidson Fat Boy Special Softail 2011
Harley Davidson Fat Boy Lo Softail 2012
Harley Davidson Fat Boy Lo Softail 2013
Harley Davidson Fat Boy Special Softail 2012
Harley Davidson Fat Boy Special 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 2007
Harley Davidson Softail Deluxe Softail 2008
Harley Davidson Softail Deluxe Softail 2009
Harley Davidson Softail Deluxe Softail 2010
Harley Davidson Softail Deluxe Softail 2011
Harley Davidson Softail Deluxe Softail 2011
Harley Davidson Softail Deluxe Softail 2012
Harley Davidson Softail Deluxe Softail 2013
Harley Davidson Softail Deluxe Softail 2012
Harley Davidson Softail Deluxe Softail 2013
Harley Davidson Softail Deluxe Softail 2014
Harley Davidson Softail Deluxe Softail 2015
Harley Davidson Softail Deluxe Softail 2016
Harley Davidson Softail Deluxe CVO CVO 2014
Harley Davidson Softail Deluxe CVO CVO 2015
Harley Davidson Cross Bones Softail 2008
Harley Davidson Cross Bones Softail 2009
Harley Davidson Cross Bones Softail 2010
Harley Davidson Cross Bones 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
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Harley Davidson Road Glide Touring 2007
Harley Davidson Road Glide Touring 2008
Harley Davidson Road Glide Touring 2009
Harley Davidson Road Glide Touring 2010
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Harley Davidson Road Glide Ultra Touring 2011
Harley Davidson Road Glide Ultra Touring 2011
Harley Davidson Road Glide Ultra Touring 2012
Harley Davidson Road Glide Ultra Touring 2013
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Harley Davidson Road Glide Ultra CVO CVO 2011
Harley Davidson Road Glide Ultra CVO CVO 2015
Harley Davidson Road Glide Custom Touring 2010
Harley Davidson Road Glide Custom Touring 2011
Harley Davidson Road Glide Custom Touring 2010
Harley Davidson Road Glide Custom Touring 2011
Harley Davidson Road Glide Custom Touring 2011
Harley Davidson Road Glide Custom Touring 2012
Harley Davidson Road Glide Custom Touring 2013
Harley Davidson Road Glide Touring 2015
Harley Davidson Road Glide Touring 2016
Harley Davidson Road Glide Custom Touring 2011
Harley Davidson Road Glide Custom Touring 2012
Harley Davidson Road Glide Custom Touring 2013
Harley Davidson Road Glide Touring 2015
Harley Davidson Road Glide Touring 2016
Harley Davidson Road Glide Special Touring 2015
Harley Davidson Road Glide Special Touring 2016
Harley Davidson Road Glide Custom CVO CVO 2012
Harley Davidson Road Glide Custom CVO CVO 2013
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
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Harley Davidson Dyna Super Glide Dyna 2009
Harley Davidson Dyna Super Glide Dyna 2010
Harley Davidson Dyna Street Bob Dyna 2007
Harley Davidson Dyna Street Bob Dyna 2008
Harley Davidson Dyna Street Bob Dyna 2009
Harley Davidson Dyna Street Bob Dyna 2010
Harley Davidson Dyna Street Bob Dyna 2011
Harley Davidson Dyna Street Bob Dyna 2012
Harley Davidson Dyna Street Bob Dyna 2013
Harley Davidson Dyna Street Bob Dyna 2012
Harley Davidson Dyna Street Bob Dyna 2013
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 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 Dyna 2006
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 2007
Harley Davidson Dyna Super Glide Custom Dyna 2008
Harley Davidson Dyna Super Glide Custom Dyna 2009
Harley Davidson Dyna Super Glide Custom Dyna 2010
Harley Davidson Dyna Super Glide Custom Dyna 2011
Harley Davidson Dyna Super Glide Custom Dyna 2012
Harley Davidson Dyna Super Glide Custom Dyna 2013
Harley Davidson Dyna Super Glide Custom Dyna 2012
Harley Davidson Dyna Super Glide Custom Dyna 2013
Harley Davidson Dyna Super Glide Custom Dyna 2014
Harley Davidson Dyna Super Glide Custom Dyna 2014
Harley Davidson Dyna Super Glide Custom Dyna 2006
Harley Davidson Dyna Fat Bob Dyna 2008
Harley Davidson Dyna Fat Bob Dyna 2009
Harley Davidson Dyna Fat Bob Dyna 2010
Harley Davidson Dyna Fat Bob Dyna 2011
Harley Davidson Dyna Fat Bob Dyna 2012
Harley Davidson Dyna Fat Bob Dyna 2012
Harley Davidson Dyna Fat Bob Dyna 2013
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 2012
Harley Davidson Dyna Fat Bob Dyna 2013
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 Super Glide Dyna 2006
Harley Davidson Dyna Super Glide 35th Anniversary Dyna 2006
Harley Davidson Dyna Low Rider Dyna 2007
Harley Davidson Dyna Low Rider Dyna 2008
Harley Davidson Dyna Low Rider Dyna 2009
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 Dyna 2006
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 Dyna 2007
Harley Davidson Dyna Wide Glide Dyna 2010
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 2012
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 Dyna Wide Glide Dyna 2006
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 Softail 2007
Harley Davidson Softail Night Train Softail 2007
Harley Davidson Softail Night Train Softail 2008
Harley Davidson Softail Night Train Softail 2009
Harley Davidson Softail Custom Softail 2007
Harley Davidson Softail Custom Softail 2008
Harley Davidson Softail Custom Softail 2009
Harley Davidson Softail Custom Softail 2010
Harley Davidson Softail Deuce Softail 2007
Harley Davidson Softail Springer Screamin Eagle CVO 2007
Harley Davidson Softail Springer Screamin Eagle CVO 2008
Harley Davidson Softail Springer CVO CVO 2009