It will never roll as freely in gear with the clutch in as it will in neutral. However, if you're convinced the clutch is dragging and the cable is set for the correct amount of free play, you need to adjust at the pushrod. Remove the very large screw head on the clutch housing and you will see a 10mm nut with a screw in the centre. Loosen the nut then turn the screw clockwise (while stopping the nut from turning) until it meets resistance. Back off a quarter turn, then re-tighten the nut while stopping the screw from turning. Adjust the cable to give the correct amount of free play at the lever and that's it. If you're still convinced that it's dragging (does it creep forward when in gear with the engine running and the lever pulled in? Is it difficult to get into neutral with the engine running? these are both signs of a dragging clutch) then the problem must be in the clutch or the wrong oil (too thick/heavy) is being used.
Maz
'76 CB500T
'75 GL1000 'Wing
'79 CB750L
'90 FJ1200
'93 GS500E
In a little place called Bexley, Kent, UK (Just south of London!)