The F650 and G650 are very sensitive to correct cable adjustment
You have to adjust the cable freeplay, when it's good and hot after al least 20 mins of riding
If you stop and adjust the cable freeplay properly, on a hot engine then most of the clutch/gear engagement issues will be fine (assuming there are no broken clutch parts)
At cold, the bike will have zero free play and this seems to be the correct procedure from my experience
I have the new upgraded cover and all seems ok - I did this as a precaution and not because I had any problems