Adjusting the clutch correctly on the Bajaj RE is very important, a clutch that is not adjusted correctly is the main reason for the gears being difficult to change.
The adjustment is just below the dashboard next to the steering column see photo. The best way to locate the correct cable is follow it down from the clutch lever.
Loosen the locking nut and the adjust until there is just 4mm of play in clutch lever. In other words from the clutch being fully released you should be able to move it just 4mm before you feel it start tension on it. See Photos.
A major problem seems to be mechanics that are trained on motorbikes where the play is normally 12mm to 14mm and they adjust the clutch on the Bajaj RE the same as they would a motorbike, doing this means the clutch will not fully disengage making it difficult to change gear.
After adjusting do not forget to re-tighten the locking nut.