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I have a 2010 Znen 250cc scooter. I wish I knew the model. First, when I start off going slow, it seems like something is slipping or something or puttering. Its kinda rough. But once I get passed that part it smooth and good. Plus when I drove it around for 25 minutes and all a sudden it started slowing down like it was losing power and then I let go of the throttle and then it died. It wouldn't start up so I waited 20 minutes and then it started back up. So I'm really confused. One guy said needs a new carb and one guy said it's the belt slipping or something. The guy I bought it from said it's a new carb. last question. I have a hot and cold gauge thing, is there place where i put antifreeze or something because I can't see it. What am I dealing with? Please and thanks