You aim to have the outer timing cover case lever come onto the 12 o clock position as the clutch is fully pulled in, not 11 o clock etc, so it needs to start about the 2 o clock position with the clutch rod clearance set correctly and the correct clearance on the cable. The outer timing cover clutch arm and also the shaft can be bent, the shaft hole can go oval which all affect the action, new parts and a rebushed hole are the fixes. The other item that can cause a heavy clutch is the handlebar lever, this needs to be the 7/8" fulcrum as if its been changed it ends up being the 1" or larger variety. Mine is set up by the book and is easy to operate, 3 springs sounds odd as there were always 4 from 59 C15 to the last B50, so is it a Unit Single Clutch.