S&S, HP103 camshaft kit with Easy Start gear drive (IOG)

0.575" valve lift. IOG = gear-driven camshafts, with internal and external drive gears. Complete kit with installation hardware, bearings and gasket.
For stock 103" engines with a stock compression ratio (CR) of 9.7:1 up to 10.5:1. Works well with unported heads and is excellent for S&S CNC ported heads. Best power in the higher RPM range. 3000-6000 RPM.
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: Not compatible with 79cc S&S heads.
Note: The installation kits required for the Easy Start camshafts are included in this complete (IOG) kit. They are available separately as a spare part from S&S for this kit as 503566.
Note: The Easy Start cam profile is a direct bolt-in fitment for these 99-06 Twin Cam models. All will require and/or may require clearancing and high-lift valve springs.
Note: Not compatible with kickstart 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
2.707 kg


HS Code
84831021


Motorcycle family
DYNA, SOFTAIL, TOURING


Original name
S&S, Easy Start gear drive HP103 camshaft kit (IOG)