Knocking again!!!!!!!!!!!!!!!!!!!!!!

 

Take off your rear dampers and disassembly them (there is a nut at the bottom of each shock).
Have a look inside and you'll see where the two pillow blocks that keep the grease are - fit a grease nipple between them on each shock exactly where the metal layer is double (fit it from the outside of the shock) - problem solved.
Simply use every 10000km white lithium grease, if you fit the grease nipples in the right point greasing is 2 minutes job without taking off your rear wheels!
Hope it helps you mate!