most likely just set up too lean. Remove the plastic caps from the needle valves (more government intrusion). Be careful. Just grab the end of one w/ pliers and pull it straight off, then the second one same way. There will be small markings at the base of each needle (L and H, for lowspeed and highspeed). Open the one marked H (turn counterclockwise) about 1/4 turn and try it again. Adjust in 1/8 turn increments till it runs strong without sagging, but still produces high RPMs.