S&S Cycle SS106-5234 570CE Chain Drive Easy Start Camshaft Kit for Twin Cam 07-17/Dyna 2006Description for S&S Cycle 570 Chain Drive Easy Start Cams Start any engine regardless of displacement or compression ratio with a stock starter The new Easy Start Cams from S&S Cycle make hard starting obsolete Heres how it works: 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, the lobe holds the exhaust valve open