Not having any experience at using the compression tester I would guess that 2kg/cm is the residual pressure in the chamber as the next rotor passes the tester connection and as that has started to compress the air in the chamber it is at 2kg/cm
This one also has the highest reading of the 3, if the seals etc on the other 2 were as good as this one then maybe they would only fall to 2 kg/cm instead of 1kg/cm.
I await further enlightenment from more experienced members.
Last Edit: Apr 20, 2016 10:44:20 GMT -5 by t140v: altered units
RE-5A Harley Davidson FLSTC Honda CBR1100 XX (Honda CB750 F2) Sold Triumph T140v