I have a coolster 125 that had maybe 30 mins on it. Fuel treatment every time and started every few days to make sure carb didn't gum up. My son was riding it the all of the sudden it fell on its face a f won't accelerate. It will idle just fine.fires right up. When you give it has it starts sputtering and when you push throttle all the way it tries t die. I went ahead and cleaned carb three times Nd didn't help. Also added new plug. I then gave up on that and but a new carb, another new spark plug, and went as far to even try and bypass fuel filter bit still no luck. I think I have the carb dialed in as well. Anyone have any ideas? Would be greatly appreciated. Thanks

 

define cleaned the carb...

did you pull jets out and clean them separately? sounds like that needs to happen.