S&S, Easy Start 640 (IOG) cam gear kit

.640" valve lift. IOG = gear driven camshafts, with inner and outer drive gears. Complete kit with installation hardware, bearings and gasket.
For 95" and up with 10.5:1 to 11.5:1 compression ratio (standard on S&S 124" engines).
The Easy Start camshafts make starting easier by reducing the build-up of compression pressure in the cylinders during starting. This is achieved by slightly lifting the exhaust valve off its seat, by means of a spring-loaded compression release lobe inside the camshaft. After starting, the compression release lobe retracts through centrifugal force. The only difference is during starting, as you will now be able to start your Big Inch engine electrically with no effort, without the need for large batteries and/or starter motors. A standard starter motor and battery are sufficient. When the engine is running, the camshafts operate as normal cams, with no loss of power, torque or anything else.
Note: The installation kit required for the Easy Start camshafts is included in this complete kit (IOG). It is available separately from S&S as a spare part for this kit as 503566.
Note: The Easy Start cam profile is not a bolt-in fitment for these 99-06 Twin Cam models. All will require and/or may require clearance checking and high-lift valve springs.
Note: Not compatible with kick-start models.
Note: Camshafts manufactured before January 2010 will require adjustable pushrods.
Note: Below 900 RPM a clicking sound may be heard. Adjust the idle speed to 1000-1100 RPM.


Specifications


Brand
S&S


Application
99-06 Twin Cam (Excl. 2006 Dyna) (NU)


Sales unit
Kit


Material
Steel


Packaging weight
2.7 kg


HS Code
87141090


Motorcycle family
DYNA, SOFTAIL, TOURING


Original name
S&S, Easy Start gear drive 640 camshaft kit (IOG)