551 Easy Start Camshaft Kit — Fits 88–106 cu in Touring, 9.0:1–9.9:1 compression

S&S CYCLE 551 Easy Start Camshaft Kit — Fits 88–106 cu in Touring, 9.0:1–9.9:1 compression – 99-06 Touring, 00-06 CVO, 00-06 Softail, 99-05 Dyna

S&S CYCLE
0925-0453
106-5442
Reduces starting compression for easier starts; bolt-in for most Touring engines; improves low- and midrange torque.
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The 551 Easy Start Camshaft Kit reduces crank compression at initial start to make cranking easier, then returns to full compression once rpm increases ⚙️.

Optimized for Touring engines (88", 96", 103"–106") with slip-on mufflers and 9.0:1–9.9:1 compression.

  • Bolt-in for stock or mildly modified Touring models and greatly improves low-end and midrange torque.
  • Strongest from idle to 4,000 rpm; improves starting without loss of performance at higher rpm.
  • Kit includes camshafts, gearcover gasket, bearings, retaining ring, o-ring, thread lock and instructions; includes a 4-gear set.
  • 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.
  • Due to the inherent characteristics of gear drives, valve train noise may be increased.
  • Made in the USA 🔧
: 0925-0453
In Stock

Data sheet

Type
Gear
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°
Harley Family
CVO
Dyna
Softail
Touring

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

Manufacturer Model Family Year Notes
Harley Davidson Road King Classic Touring 2004
Harley Davidson Road King Classic Touring 2003
Harley Davidson Road King Classic Touring 2006
Harley Davidson Road King Touring 1999
Harley Davidson Road King Custom Touring 2004
Harley Davidson Road King Custom Touring 2006
Harley Davidson Road King Screamin Eagle CVO 2002
Harley Davidson Road King Screamin Eagle CVO 2003
Harley Davidson Road King Custom Touring 2004
Harley Davidson Road King Custom Touring 2005
Harley Davidson Electra Glide Touring 2001
Harley Davidson Electra Glide Touring 2006
Harley Davidson Electra Glide Classic Touring 2003
Harley Davidson Electra Glide Classic Touring 2005
Harley Davidson Electra Glide Classic Touring 2005
Harley Davidson Electra Glide Screamin Eagle CVO 2005
Harley Davidson Electra Glide Ultra Classic Touring 1999
Harley Davidson Electra Glide Ultra Classic Touring 2000
Harley Davidson Electra Glide Ultra Classic Touring 2002
Harley Davidson Electra Glide Ultra Classic Touring 2004
Harley Davidson Electra Glide Ultra Classic Screamin Eagle CVO 2006
Harley Davidson Heritage Softail Softail 2006
Harley Davidson Heritage Softail Classic Softail 2000
Harley Davidson Heritage Softail Classic Softail 2002
Harley Davidson Heritage Softail Classic Softail 2005
Harley Davidson Heritage Softail Classic Softail 2002
Harley Davidson Heritage Softail Classic Softail 2006
Harley Davidson Fat Boy Softail 2005
Harley Davidson Fat Boy Softail 2006
Harley Davidson Fat Boy 15th Anniversary Softail 2005
Harley Davidson Fat Boy Screamin Eagle CVO 2005
Harley Davidson Fat Boy Screamin Eagle CVO 2006
Harley Davidson Softail Deluxe Softail 2005
Harley Davidson Softail Deluxe Softail 2006
Harley Davidson Heritage Softail Springer Softail 2001
Harley Davidson Heritage Softail Springer Softail 2002
Harley Davidson Heritage Softail Springer Softail 2003
Harley Davidson Softail Springer Classic Softail 2005
Harley Davidson Softail Springer Classic Softail 2006
Harley Davidson Softail Springer Classic Softail 2005
Harley Davidson Softail Springer Classic Softail 2006
Harley Davidson Heritage Softail Springer Softail 2003
Harley Davidson Road Glide Touring 2001
Harley Davidson Road Glide Touring 2002
Harley Davidson Road Glide Touring 1999
Harley Davidson Road Glide Touring 2004
Harley Davidson Road Glide Screamin Eagle CVO 2000
Harley Davidson Road Glide Screamin Eagle CVO 2001
Harley Davidson Dyna Super Glide Dyna 1999
Harley Davidson Dyna Super Glide Dyna 2001
Harley Davidson Dyna Super Glide Dyna 2002
Harley Davidson Dyna Super Glide Dyna 2003
Harley Davidson Dyna Super Glide Dyna 2004
Harley Davidson Dyna Super Glide Dyna 2005
Harley Davidson Dyna Super Glide Custom Dyna 2005
Harley Davidson Dyna Super Glide Custom Dyna 2005
Harley Davidson Dyna Super Glide Dyna 2004
Harley Davidson Dyna Super Glide Dyna 2005
Harley Davidson Dyna Low Rider Dyna 1999
Harley Davidson Dyna Low Rider Dyna 2000
Harley Davidson Dyna Low Rider Dyna 2001
Harley Davidson Dyna Low Rider Dyna 2002
Harley Davidson Dyna Low Rider Dyna 2003
Harley Davidson Dyna Low Rider Dyna 2004
Harley Davidson Dyna Low Rider Dyna 2005
Harley Davidson Dyna Low Rider Dyna 2004
Harley Davidson Dyna Low Rider Dyna 2005
Harley Davidson Dyna Wide Glide Dyna 1999
Harley Davidson Dyna Wide Glide Dyna 2000
Harley Davidson Dyna Wide Glide Dyna 2001
Harley Davidson Dyna Wide Glide Dyna 2002
Harley Davidson Dyna Wide Glide Dyna 2003
Harley Davidson Dyna Wide Glide Dyna 2004
Harley Davidson Dyna Wide Glide Dyna 2005
Harley Davidson Dyna Wide Glide Limited Edition CVO 2001
Harley Davidson Dyna Wide Glide Limited Edition CVO 2002
Harley Davidson Dyna Wide Glide Dyna 2004
Harley Davidson Dyna Wide Glide Dyna 2005
Harley Davidson Dyna Super Glide Sport Dyna 1999
Harley Davidson Dyna Super Glide Sport Dyna 2000
Harley Davidson Dyna Super Glide Sport Dyna 2001
Harley Davidson Dyna Super Glide Sport Dyna 2002
Harley Davidson Dyna Super Glide Sport Dyna 2003
Harley Davidson Dyna Super Glide Sport Dyna 2004
Harley Davidson Dyna Super Glide Sport Dyna 2004
Harley Davidson Dyna Super Glide Sport Dyna 2005
Harley Davidson Dyna Super Glide T-Sport Dyna 2001
Harley Davidson Dyna Super Glide T-Sport Dyna 2002
Harley Davidson Dyna Super Glide T-Sport Dyna 2003
Harley Davidson Softail Softail 2003
Harley Davidson Softail Night Train Softail 2002
Harley Davidson Softail Night Train Softail 2003
Harley Davidson Softail Night Train Softail 2003
Harley Davidson Softail Night Train Softail 2005
Harley Davidson Softail Deuce Softail 2001
Harley Davidson Softail Deuce Softail 2002
Harley Davidson Softail Deuce Softail 2003
Harley Davidson Softail Deuce Softail 2004
Harley Davidson Softail Deuce Softail 2005
Harley Davidson Softail Deuce Softail 2006
Harley Davidson Softail Deuce Softail 2001
Harley Davidson Softail Deuce Softail 2002
Harley Davidson Softail Deuce Softail 2003
Harley Davidson Softail Deuce Softail 2004
Harley Davidson Softail Deuce Softail 2005
Harley Davidson Softail Deuce Softail 2006
Harley Davidson Softail Deuce Screamin Eagle CVO 2003
Harley Davidson Softail Deuce Screamin Eagle CVO 2004
Harley Davidson Softail Softail 2003
Harley Davidson Softail Softail 2004
Harley Davidson Softail Softail 2005
Harley Davidson Softail Springer Softail 2000
Harley Davidson Softail Springer Softail 2001
Harley Davidson Softail Springer Softail 2002
Harley Davidson Softail Springer Softail 2003
Harley Davidson Softail Springer Softail 2004
Harley Davidson Softail Springer Softail 2005
Harley Davidson Softail Springer Softail 2003
Harley Davidson Softail Springer Softail 2004
Harley Davidson Softail Springer Softail 2005