Speedo Seats & Luggage- racks Frame Chassis Suspension Forktubes Wheels Brake Fenders Gastanks Motorparts Gaskets Intake Transmission & Driveline Exhaust Electrical & Lights Handlebars, Cables & Mirrors Oil tanks Oil & Chemicals Fasteners Windshields Forward controls, Footpegs Miscellaneous MOTOR PARTS - LOWER END 10 605 AFTERMARKET PARTS & ACCESSORIES FOR CUSTOM MOTORCYCLES / MOTORCYCLESTOREHOUSE.COM 99-17 TWIN CAM S&S - EASY START CAMS TWIN CAM How it works Easy Start Cams make starting easier by reducing the build-up of cranking pressure in the cylinders during starting. This is done by lifting the exhaust valve slightly of its seat, with a spring loaded compression release lobe inside the camshaft. After starting the compression release lobe is retracted by centrifugal force. The difference The only difference is during starting since you will now be able to electric start your Big Inch engine effortless, without the use of big batteries and/or starter motors. A stock starter and battery is enough. The same When the engine is running the camshafts function as regular cams, without any loss in power, torque or anything else. S&S CAMSHAFT SPECIFICATION CHART Intake° Exhaust° Duration° Valve Lift Valve Lift TDC Open/Close Open/Close In/Ex In/Ex In/Ex 551 15/20 39/18 215/237 .550" .163"/.179" 570 20/40 55/20 240/255 .570" .187"/.179" HP103 29/49 45/26 249/251 .575" .199"/.206" 583 5/15 60/22 204/262 .583" .131"/.199" 585 20/45 60/20 245/260 .585" .186"/.178" MR103 13/33 50/22 226/252 .585" .172"/.177" 635HO 19.5/43.5 58.5/37.5 243/276 .635" .186"/.284" 640 25/60 65/25 265/270 .640" .228"/.221" 675 25/64 70/25 269/275 .675" .235"/.205" Timing and duration measured at zero lash and .053" tappet lift of base circle. To avoid coil bind, allow min. .030" more free valve travel than the max. valve lift that is mentioned. To achieve adequate valve spring clearance, several higher lift top collars are available which require no machining. S&S EASY START CAMS Easy Start cams reduce cranking compression, only during starting. Designed by S&S to overcome the sometimes troublesome starting of big inch, high compression engines. Note: Required installation kits for Easy Start Cams are included in complete (IOG) kits only. They are separately available from S&S as 503566 (early models) and 531268 (late models) for gear drive models only. Note: Not compatible with kick start models. Note: Camshafts made before Jan. 2010 will require adjustable pushrods. Note: Below 900 RPM you may hear a clicking sound. Adjust idle speed to 1000-1100 RPM. Note 1: Not to be used with S&S 79cc heads 99-06 Twin Cam (excl. 2006 Dyna) No Easy Start Cam grind is bolt-in for 99-06 TCA/B (excl. 2006 Dyna) models. All will / may require clearancing and require high lift valve springs. IG = Gear Drive cams with inner gears only IOG = Gear Drive cams with inner & outer drive gear complete kit with hardware and gasket CD = Chain Drive camshafts, complete kit IG IOG CD -- 531726 -- 551 cams, .550" lift 531734 531727 -- 570 cams, .570" lift 592011 592010 592007 HP103, .575" lift (note 1) -- 531728 -- 583 cams, .583" lift 592017 592016 592013 MR103 cams, .585" lift -- 531729 -- 585 cams, .585" lift -- 592004 -- 635HO, .635" lift (note 1) -- 531731 -- 640 cams, .640" lift -- 531732 -- 675 cams, .675" lift 06-17 Dyna; 07-17 Softail; 07-16 Touring Only 551, 570, 583, 585, HP103 and MR103 cams are bolt-in, all others may / will require clearancing and require high lift valve springs. IG = Gear Drive cams with inner gears only IOG = Gear Drive cams with inner & outer drive gear kit CD = Chain Drive camshafts, complete kit IG IOG CD -- 531712 531706 551 cams, .550" lift 531720 531713 531707 570 cams, .570" lift -- 532603 532600 HP103, .575" lift (note 1) -- 531714 531708 583 cams, .583" lift 531722 531715 531709 585 cams, .585" lift -- 532602 532599 MR103 cams, 585" lift 531723 531716 531710 625 cams, .625" lift 531724 531717 531711 640 cams, .640" lift -- 531718 -- 675 cams, .675" lift IG = Camshafts with inner gears only IOG = Camshafts & outer drive gear kit CD = Chaindrive camshafts, complete kit What are the most popular Easy Start Twin Cam grinds? 551 Torque cam Great Bolt-in cam for 07-16 Dressers (99-06 models may require clearancing). Good for 07-16 96" to 106" Touring models in combination with slip-on mufflers, high flow air filter and 9:1 to 10:1 compression. Pulls from idle to 4000 RPM. 583 Midrange cam Good for all Twin Cam models in combination with slip-on mufflers and a high flow air filter. Pulls from 1500 to 5000 RPM. 585 Top-end cam Good for 06-up 96" to 106" Twin Cam in combination with slip-on mufflers, high flow airfilter and a 9:1 to 10.5:1 compression. Pulls from 3000 to 6000 RPM. Top: Shows start mode of the cams, a spring keeps the compression release lobe notch in place. Bottom: Shows running mode. When the engine is started, centrifugal forces pull the compression release lobe out of the way. tech-tip 58 CHAIN-DRIVE GEAR-DRIVE THE DIFFERENCE? No more hard starting & full power during riding Application recommendations: 551G: Bolt-in torque for stock 96" Touring bikes. Strongest cam from idle to 4000 RPM for 96" to 106". Not recommended for 10:1 or higher CR 570G: Bolt-in 88" to 103" with 9:1 to 10:1 CR. 32005700 RPM overall power increase HP103: Bolt-in for stock 103" engines with stock 9.7:1CR up to 10.5:1CR. Works well with unported heads and great for S&S CNC ported heads. Best power in the higher RPM range. 3000-6000 RPM 583C: Bolt-in. 88 to 103" engines with compression ratios between 9.7:1 to 10.5:1 and 106" to 124" engines with 9:1 to 10:1 CR. Provides massive horsepower and torque from 3000 RPM. 1500-5000 RPM range 585G: Bolt-in 88" to 106" with 9.7:1 to 10.5 CR and 106" to 124" with 9:1 to 10:1 CR. 3500-6000 RPM for 88" to 103" and 2500-5500 for larger engines MR103: Bolt-in for stock 103" engines with stock 9.7:1CR up to 10.5:1CR. Works well with unported heads and great for S&S CNC ported heads. More power across RPM range. 25005500 RPM 625G: 95"-up with 10.0:1 to 10.8:1 CR 640G: 95"-up with 10.5:1 to 11.5:1 CR (stock in S&S 124" engines) 675G: Very high lift. For +120" engines with at least 1:11 CR. 4500-6500 RPM
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