I noticed today that my kx85 when put in first jerks and wants to stall unless I give it has to keep it going I also noticed now that the clutch can be let almost all the way out before it grabs and the clutch was fine yesterday when I was putting it around my yard

 

There are fingers on the clutcdh plates that alighn with the grooves inside the hub, the fingers wear into the grooves after a while and they then stick because they dont glide smoothly anymore. Check the hub for grooves, if so thats yourd problem