I have a 6 month old Kawasaki W800 I bought new. Sometimes when I ride gear changes seem stiff and clunky. Other times they seem smooth and normal.
Would anyone know what could be causing this? Doesnt seem to matter if the engine is warm or not.
As the motor cycle is 6 months from new I would recommend putting it into the suppliers repair shop under warranty. If you were to attempt any sort of dismantling to effect a repair you will more or less invalidate any warranties for the motor cycle.
The symptoms point to either a clutch or gearbox fault.