I don't understand what that little rubber piece is for that fits on the inner cable between the leaver and the outer cable. It just moves around in there and seems to serve no purpose!! Mine's getting all chewed up. I tried to get my cable off today to lube it but couldn't get enough slack in it to get it free, not sure what's up with that.
Squire - I found the little rubber boot at the handlebar end adrift as well. I stuck it back over the end of the cable housing. It seems to be happy there, for the moment!
If you rotate the clutch arm at the engine cover, you will introduce enough slack to get the cable free. I found that if I pulled the clutch lever to move the arm, I could just hold it in place, but then I couldn't remove the cable end with only one hand! Try Arizoni's trick:
To try this out I would get my 8" adjustable wrench and open the jaws so they straddle the arm on clutch lever on the side cover.
Turning it slightly counterclockwise will rotate the lever and allow me to slip the enlarged end of the cable out of the sheet metal clip on the lever.
Once the cable end is free of the clip, I would release the wrenches pressure allowing the lever to return to its normal position.