I did adjust the idle knob and a couple of days ago when I had some trouble I guess I adjusted it to much to the left, next time I went to adjust it, POOF the screw was gone....so I adjusted the throttle and clutch cable to try to get it going again and finally It did and barely got me home. Next day I had to go to work by way of motorized bicycle, it did great getting there but on the way back home the engine would go good for 30 sec, then slow down substantially. It did this the entire way home, until I got about 50 yards from my place, then it just wouldn't start anymore. Im puzzled as heck and I am wondering if I should open up the engine and see whats going on inside...but then I wouldn't even know what to look for, AhhhhHHHhhhHHHhhhhh this damn motorized bicycle is using up all my patience