My LG50 only runs great up untill about 3/4 throttle. The choke works great and it starts easily. I just finished installing a brand new carb. I checked compression (125lbs), reed valves, oil seals, gas tank,vent, and installed new plug. After 3/4 throttle, i have to feather the gas to keep it running or the speed goes up and down. If i block off about 1/3 of the carb opening (bottom 1/3) with duct tape, it runs fine. Any suggestions will be appreciated. This quad is the same as a Polaris scrambler 50.