I'm having like this same exact problem, but I can't figure out why..
I recently changed the oil about 10 hours of riding ago, which was my first oil change. I have a yz250f 2005 and have maybe a total of 20 hours on it..
Washed the bike today after riding it pretty hard, go to start it up and take it for a quick spin and my clutch was grabbing.. so i couldnt get it going without doing a rolling start...
my clutch is grabbing too, but ive had a few other runs with this same oil and ive never had this problem, do you think it could still be the problem?
Also I don't use yala-lube "R", just regular yama-lube..?