Clutch Slip
Dont know if this is any use, I was in my dealers today and the subject of clutch slip came up. Apparently if your left hand guard falls down and is rubbing the end of the clutch lever (i.e. no free play), the clutch will slip badly.
The simple solution being to rotate the hand guard away from the clutch lever (i.e. up) to give back the free play, pull in and release the clutch a few times and hopefully you should be back to normal.
As a rule if your dry clutch burns out you should smell it first.