Hi. My buzz 50 quad goes very slow on full throttle. It will also only move if the air/fuel mixture screw is all the way in. I will start and idol fine no matter where the screw is and the idol screw works fine. But it will only accelerate with the air/ fuel screw all the way in. Once it does accelorate, it only goes slow. I have cleaned out the carb twice and it's all clear. I have checked there is no restrictors making it slow. I dont know what to try next.

 

compression test

 

Compression seems good. Spark also seems good too. Using premix at 40/1.