Start any engine regardless of displacement or compression ratio with a stock starter.

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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

S&S Cycle logo

Easy Start Cams

S&S® Easy Start Cams


 

 

Start Any Engine!

Regardless of displacement or compression ratio with a stock starter, Easy Start Cams from S&S® Cycle make hard starting obsolete for 1999-up big twins. Available in chain drive and gear drive versions.
Don't get caught "dead" without them! More Proven Performance® from S&S Cycle, Inc., the leader in V-Twin high performance parts since 1958.

 

Features:

 

• Start any engine with a stock starter
• Save your starter and battery!
• Reliable – tested for 10,000 starts
and didn't even run the battery down!
• Automatic – no buttons to push

THREE MOST POPULAR GRINDS

A bolt-in cam for all RPM ranges.
Something for everyone.

S&S® set out to develop a new group of bolt in cams for 2007-up big twins. The three design targets were low end torque for touring, peak horsepower and a cam that would offer the best possible combination between torque and horsepower. The 551 emerged as the touring cam and the 583 is a great over all cam. The proven 585 posted the best results for peak horsepower.
 

Easy Start Motorcycle Cams

551 Torque Cam


  • Optimized for a 2007-up 96 to 106 CID touring bike with slip-on mufflers and 9.0 to 10.0:1 compression
  • Best bolt-in cam available for dressers
  • Pulls hard from idle to 4000 rpm.
551 touring cam dyno chart

583 Midrange Cam


  • Optimized for use as a great over-all cam in the Softail®/ Dyna® lines, but can be used in any 2007-up big twin model.
  • Provides strong low end torque and horsepower that you can really feel.
  • Strongest from 1500-5000 in a Softail/Dyna application.
fatboy 583 cam dyno chart

585 Horsepower Cam


  • Optimized for a 2007-up Softail or 2006-up Dyna 96 to 106 CID with slip-on mufflers, high flow air filter and 9.0 to 10.5:1 compression.
  • Great results from 3000-6000 rpm.
Fatboy 585 Cam dynb chart

HERE'S HOW IT WORKS

 

ONE
Each of the two exhaust cam lobes are equipped with a spring loaded compression release lobe on the "heal" of the cam at the point where the valve would normally be fully closed.

 


TWO
The lobe holds the exhaust valve open slightly at cranking speed. This releases some of the compression, making the engine much easier to crank.


THREE
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. This allows a stock starter and battery to start nearly any engine.

Reduces cranking compression – easier on starting system!

compression release lobe

For 2007-up Big Twins

S&S Easy Start Cams

Cam Name   S&S
Chain Drive
S&S Gear Drive  
Complete Kit Complete Kit Cams with Inner Gears
Part # Part #
(Stock Oil Pump)
Part #
(Stock Oil Pump)
Part #
(S&S Oil Pump)
546 N/A N/A N/A 330-0139
551 106-4947 106-5737 106-5736 N/A
570 106-5234 106-5221 106-5220 N/A
557* 106-5234 330-0057 330-0056 N/A
583 106-5807 106-5811 106-5810 N/A
585 106-5233 106-5225 106-5224 330-0145
625 106-5239 106-5229 106-5228 N/A
640 106-5235 106-4850 106-4849 330-0144
675 N/A 106-5741 106-5740 N/A
Note: 2006 Dyna® Models use 2007-Up style cams.           *Specifically Developed for H-D® Tri Glide® Models

 

 

For 1999-'06 Big Twins

S&S Easy Start Cams

Cam Name S&S
Chain Drive
S&S Gear Drive
Complete Kit Complete Kit Cams with Inner Gears
Part # Part #
(Stock Oil Pump)
Part #
(Stock Oil Pump)
Part #
(S&S Oil Pump)
551 106-5293 106-5442 106-5441  N/A
570 106-5296 106-5243 106-5242 106-4751
583 106-5289 106-5859 106-5858  N/A
585 106-5299 106-5247 106-5246 106-4771
625 106-5302 106-5251 106-5250 106-5212
640 106-5305 106-4840 106-4839 106-4781
675 N/A 106-5255 106-5254 106-5215
Note: 2006 Dyna® Models use 2007-Up style cams.

 

 

Specs for S&S® Chain Drive & Gear Drive Camshafts for 1999-Up Big Twins
Cam Valve Timing (open/close) Valve Duration Valve Lift Centerline Lift @ TDC
Intake Exhaust Intake Exhaust Intake Exhaust Intake Exhaust

Open BTDC/Close ABDC

Open BBDC/Close ATDC
HP103 20˚/49˚ 50˚/22˚ 249˚ 251˚ .575" 102.7˚ 101.5˚ .199" .206"
MR103 13˚/33˚ 50˚/72˚ 226˚ 252˚ .585" 100˚ 104˚ .097" .191"
475 2˚/34˚ 36˚/4˚ 216˚ 220˚ .475" 106˚ 106˚ .060" .060"
509 18˚/18˚ 46˚/11˚ 216˚ 237˚ .509" 90˚ 107.5˚ .174" .140"
510 20˚/38˚ 52˚/20˚ 238˚ 252˚ .510" 99˚ 106˚ .187" .178"
546 5˚/55˚ 52˚/5˚ 240˚ 237˚ .546" 115˚ 113.5˚ .126" .106"
551** 17°/19° 41°/17° 216° 238° .550" 91˚ 102˚ .178" .170"
557 6°/27° 39°/12° 212° 231° .557" 100° 103° .113" .146"
570 20˚/40˚ 55˚/20˚ 240˚ 255˚ .570" 100˚ 107.5˚ .187" .179"
583 5˚/18˚ 58˚/24˚ 203˚ 262˚ .583" 96.5˚ 107˚ .113" .206"
585 20˚/45˚ 60˚/20˚ 245˚ 260˚ .585" 102.5˚ 110˚ .186" .179"
625 20˚/55˚ 60˚/20˚ 255˚ 260˚ .625" 107.5˚ 110˚ .189" .184"
635HO 19.5˚/43.5˚ 58.5˚/37.5˚ 243˚ 276˚ .635" 102˚ 100.5˚ .186" .284"
640 25˚/60˚ 65˚/25˚ 265˚ 270˚ .640" 107.5˚ 110˚ .228" .214"
675 25˚/64˚ 70˚/25˚ 269˚ 275˚ .675" 109.5˚ 112.5˚ .235" .205"

Note: Although several cam grinds were used in stock engines from 1999-’06, the timing specs of the 475G cams is most similar to cams used in 1999-’03 EFI engines. **551 cams are not recommended with compression ratio of 10:1 or higher.

NOTE: Stock valve springs in 1999-’04 big twin models can handle cams with valve lifts as high as .515". Stock valve springs in 2005-up engines can accommodate valve lifts up to .590".

 

Cross Reference chart

S&S Cam Name
H-D® Screamin' Eagle® Stock Cam
Andrews® Stock Cam
Application
551
SE-203/255
21H/26H
Best for Touring Models
570
---
54H
All Big Twin Models
583
SE-203/255
21H/26H
Best for Softail®/Dyna® Models
585
SE-211/251/257
31H/32H/50H/55H/67H
All Big Twin Models
625
SE-258/260
60H
All Big Twin Models
640
SE-264
59H
All Big Twin Models
675
---
64H
All Big Twin Models