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Hey. I am hoping for a little help please. I bought a 08 used linhai main street scooter recently. It had 3700 miles on it. The bike is a 8 out of 10 cosmetically and the motor (when running) is super strong with plenty of power. My problem is it will run beautifully for 2 or 3 hours then the idle will get real low then it will die. It will fire right up usually but run real low on idle and will die when giving it even a little throttle. I have noticed that at times when coming to a stop the motor will be revving fast and take a little while to slow to a normal idle. This is when the problem usually starts. I also notice a very slight stumble in the motor. I have adjusted the idle and fuel mixture screws and it will just purr. Is it possible the mixture screw is not staying put?. This bike runs like a champ when is going right. The fuel filter appears to be good as there is a good flow thru it. The cdi appears to be functioning properly. There is no visible vacuum loss that I can tell. I need this bike to be dependable, I paid $1500.00 for it and have put new tires on it and it is registered. All I need is it to be dependable. Any help is greatly appreciated.