I built my revo several months back and have had the bugs worked out for a while, i put a picco .26 on it and had no problems till now. for some reason the slipper clutch will not grab anymore. started when i went to slayer gears in the trans. i put a brand new slipper setup on it and it lasted almost a full tank of fuel and then it started slipping and won't grab at all. any suggestions?