I just bought my ody in Jan and have had the same problem.Took clutch off,it was the stock clutch,inspected it for wear and sprayed comet clutch lube on parts and put it back together,still did the same thing.So Ive been driving it like that.Finally bought a new belt and tried it out today,that made a world of difference.It wont sit still in gear now,it takes off{I need to adjust the idle lower}I'm sure that clutch will probably need to be replaced pretty soon,but I would try a new belt first and see what happens,because now mine is engaging right away and before I had to blip the throttle pretty good for it to take off